'Dancing With the Stars' couple allegedly 'fighting a lot' behind-the-scenes

There's drama brewing behind-the-scenes on "Dancing With the Stars" this season.

On Monday night's episode of the hit ABC dance competition show, host Erin Andrews revealed that Maks Chmerkovskiy wouldn't be competing this week because he's "dealing with a personal issue."

SEE ALSO: Dancing with the Stars week 3 recap: Which couple should go home?

Pro Alan Bersten danced with Chmerkovskiy's partner, Vanessa Lachey, instead. Bersten was eliminated with Debbie Gibson last week.

According to sources close to "DWTS," though, Chmerkovskiy's "personal issues" are directly correlated to his contentious relationship with Lachey.

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Maksim Chmerkovskiy and Vanessa Lachey together
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Maksim Chmerkovskiy and Vanessa Lachey together
DANCING WITH THE STARS - 'Episode 2502A' - With the first elimination having taken place on Monday, the 12 remaining celebrities ready themselves for one of the hottest nights in the ballroom - Latin Night, on 'Dancing with the Stars,' live, TUESDAY, SEPTEMBER 26 (9:00-11:00 p.m. EDT), on The ABC Television Network. Each couple will perform a samba, rumba, cha cha, Paso Dobl� Argentine Tango or salsa, vying for America's vote. At the end of the night, the second elimination of the season will take place. (Eric McCandless/ABC via Getty Images) MAKSIM CHMERKOVSKIY, VANESSA LACHEY
DANCING WITH THE STARS - 'Episode 2502A' - With the first elimination having taken place on Monday, the 12 remaining celebrities ready themselves for one of the hottest nights in the ballroom - Latin Night, on 'Dancing with the Stars,' live, TUESDAY, SEPTEMBER 26 (9:00-11:00 p.m. EDT), on The ABC Television Network. Each couple will perform a samba, rumba, cha cha, Paso Dobl� Argentine Tango or salsa, vying for America's vote. At the end of the night, the second elimination of the season will take place. (Eric McCandless/ABC via Getty Images) TOM BERGERON, VANESSA LACHEY, MAKSIM CHMERKOVSKIY
DANCING WITH THE STARS - 'Episode 2502A' - With the first elimination having taken place on Monday, the 12 remaining celebrities ready themselves for one of the hottest nights in the ballroom - Latin Night, on 'Dancing with the Stars,' live, TUESDAY, SEPTEMBER 26 (9:00-11:00 p.m. EDT), on The ABC Television Network. Each couple will perform a samba, rumba, cha cha, Paso Dobl� Argentine Tango or salsa, vying for America's vote. At the end of the night, the second elimination of the season will take place. (Eric McCandless/ABC via Getty Images) VANESSA LACHEY, MAKSIM CHMERKOVSKIY
DANCING WITH THE STARS - 'Episode 2502' - The 13 celebrities dance to some of the most classic ballroom styles that everyone knows and loves, as Ballroom Night comes to 'Dancing with the Stars,' live, MONDAY, SEPTEMBER 25 (8:00-10:01 p.m. EDT), on The ABC Television Network. Each couple will perform timeless favorites, including a quickstep, waltz, tango, foxtrot or Viennese waltz, vying for America's vote. At the end of the night, the first elimination of the season will take place. ABC/Eric McCandless / ABC Via Getty Images) VANESSA LACHEY, MAKSIM CHMERKOVSKIY
DANCING WITH THE STARS - 'Episode 2502' - The 13 celebrities dance to some of the most classic ballroom styles that everyone knows and loves, as Ballroom Night comes to 'Dancing with the Stars,' live, MONDAY, SEPTEMBER 25 (8:00-10:01 p.m. EDT), on The ABC Television Network. Each couple will perform timeless favorites, including a quickstep, waltz, tango, foxtrot or Viennese waltz, vying for America's vote. At the end of the night, the first elimination of the season will take place. ABC/Eric McCandless / ABC Via Getty Images) VANESSA LACHEY, MAKSIM CHMERKOVSKIY
LOS ANGELES, CA - SEPTEMBER 18: TV personality Vanessa Lachey (L) and dancer Maksim Chmerkovskiy attend 'Dancing with the Stars' season 25 at CBS Televison City on September 18, 2017 in Los Angeles, California. (Photo by David Livingston/Getty Images)
LOS ANGELES, CA - SEPTEMBER 18: TV personality Vanessa Lachey (R) and dancer Maksim Chmerkovskiy attend 'Dancing with the Stars' season 25 at CBS Televison City on September 18, 2017 in Los Angeles, California. (Photo by David Livingston/Getty Images)
DANCING WITH THE STARS - 'Episode 2501' - 'Dancing with the Stars' is back with a new, dynamic cast of celebrities who are ready to hit the ballroom floor and celebrate the show's landmark 25th season. The competition begins with the two-hour season premiere, live, MONDAY, SEPTEMBER 18 (8:00-10:01 p.m. EDT), on The ABC Television Network. (Eric McCandless via Getty Images) PETA MURGATROYD, NICK LACHEY, VANESSA LACHEY, MAKSIM CHMERKOVSKIY
DANCING WITH THE STARS - 'Episode 2501' - 'Dancing with the Stars' is back with a new, dynamic cast of celebrities who are ready to hit the ballroom floor and celebrate the show's landmark 25th season. The competition begins with the two-hour season premiere, live, MONDAY, SEPTEMBER 18 (8:00-10:01 p.m. EDT), on The ABC Television Network. (Adam Rose/ABC via Getty Images) PETA MURGATROYD, NICK LACHEY, MAKSIM CHMERKOVSKIY, VANESSA LACHEY
NEW YORK, NY - SEPTEMBER 06: Vanessa Lachey and Maks Chmerkovskiy pose at ABC's 'Dancing with the Stars' Season 5 cast announcement event at Planet Hollywood Times Square on September 6, 2017 in New York City. (Photo by Bruce Glikas/Bruce Glikas/Getty Images)
GOOD MORNING AMERICA - The cast of Season 25 of 'Dancing with the Stars,' are announced live on 'Good Morning America,' Wednesday, September 6, 2017 on the ABC Television Network. (Photo by Lou Rocco/ABC via Getty Images) MAKS CHMERKOVSKIY, VANESSA LACHEY
NEW YORK, NY - SEPTEMBER 06: (L-R) Vanessa Lachey, Nick Lachey, Peta Murgatroyd and Maks Chmerkovskiy pose at ABC's 'Dancing with the Stars' Season 5 cast announcement event at Planet Hollywood Times Square on September 6, 2017 in New York City. (Photo by Bruce Glikas/Bruce Glikas/Getty Images)
DANCING WITH THE STARS - VANESSA LACHEY AND MAKSIM CHMERKOVSKIY - The celebrity cast of 'Dancing with the Stars' are donning their glitzy wardrobe and slipping on their dancing shoes as they ready themselves for their first dance on the ballroom floor, as the season kicks off on MONDAY, SEPTEMBER 18 (8:00-10:01 p.m. EST), on the ABC Television Network. (Craig Sjodin via Getty Images)
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"They've been fighting a lot," People reported. "There's a big chemistry issue. They both have big personalities and that's not always the best recipe for a good partnership."

Adding to the potential drama would be the presence of Lachey's husband, Nick, who is also competing on season 25 of "Dancing With the Stars." Not only that, but he's paired with Chmerkovskiy's real-life partner, wife Peta Murgatroyd.

The insider alleges that -- though it's unclear where it truly stems from -- the bad blood between Chmerkovskiy and Lachey could end the "DWTS" pro's time on the season for good.

"I wouldn't be surprised if Maks doesn't return as her partner for the rest of the season," the source finished.

Though pros have been permanently sidelined in the past due to injuries, this would seemingly be the first time that a pro stepped down from the competition because of inter-couple tension.

RELATED: Odds of every couple winning this season of "Dancing With the Stars":

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'Dancing With the Stars' Season 25: Odds to win (TV Line)
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'Dancing With the Stars' Season 25: Odds to win (TV Line)

Barbara Corcoran (with pro Keo Motsepe)

Odds: 40-1

Pros and Cons: I’ve got a question for that wise owl from the Tootsie Pop commercials: How many seasons of DWTS does it take for Motsepe to get a decent partner? Aside from his sixth-place finish with Jodie Sweetin in Season 22, Motsepe has alternated between 13th and 11th place with his four other previous partners. (Perhaps one day, we’ll actually get to see his personality and choreographing prowess.) Shark Tankvet Corcoran will undoubtedly be fun to watch, and Dancing viewers have a soft spot for amateurs who give it their all, regardless of skill. But in the end, neither she nor Motsepe seem long for the Season 25 world.

(Craig Sjodin via Getty Images)

Derek Fisher (with pro Sharna Burgess)

Odds: 35-1

Pros and Cons: NBA players have never had tremendous success on DWTS, which sets an unfortunate precedent for Fisher. Plus, given their difference in height and weight, Fisher and Burgess probably have a lot of clumsy routines in their future. The bright side: Burgess has yet to encounter a partner whose shortcomings she couldn’t choreograph around, from Noah Galloway to James Hinchcliffe to Bonner Bolton. Season 25 might not be a victorious one for Burgess, but her creativity and enthusiasm are always massively entertaining.

(Craig Sjodin via Getty Images)

Frankie Muniz (with pro Witney Carson)

Odds: 30-1

Pros and Cons: Carson won the Mirrorball with Alfonso Ribeiro in Season 19, and has since been paired with contestants ranging from awful (sorry, Chris Soules!) to decent (Carlos PenaVega). I would love for Muniz to be a sleeper champion in Season 25, but the more likely scenario is that this actor-turned-race car driver will struggle to keep up with increasingly tricky dance styles.

(Craig Sjodin via Getty Images)

Terrell Owens (with pro Cheryl Burke)

Odds: 25-1

Pros and Cons: Burke has already proven that she can confidently coach football players through their Dancing troubles: She snagged the Mirrorball with Emmitt Smith in Season 3 and placed fourth with Chad Johnson in Season 10. But even if Burke does turn T.O. into a ballroom pro, he’ll have to get the audience on his side if he wants to go far. Given the many controversies that have followed him throughout his NFL career (including that Nicollette Sheridan video), earning votes may not come so easily to him — and viewers might be even less inclined to back a pro footballer two seasons in a row, now that Rashad Jennings is the reigning Dancing champ.

(Heidi Gutman via Getty Images)

Nick Lachey (with pro Peta Murgatroyd)

Odds: 20-1

Pros and Cons: Lachey might be feeling the most pressure of any Season 25 contestant, considering brother Drew already walked away with the Mirrorball in Season 2. The good news? The elder Lachey can rely on the exact same boy-band dance experience that his sibling did, which means he probably won’t be the first (or even third) one eliminated. The bad news? After spending years in front of the camera — from reality show Newlyweds: Nick and Jessica to competition series The Sing-Off — the viewing audience has likely had enough of Lachey, and he’ll have to be sensational on the dance floor to win over cynical voters.

(Craig Sjodin via Getty Images)

Drew Scott (with pro Emma Slater)

Odds: 18-1

Pros and Cons: Though there’s plenty of viewers who find HGTV personalities insufferable, there’s thousands more who swoon daily over the Property Brothers — and that voting bloc will seriously help Scott’s chances in the competition. When Scott is on television, we usually see him as a straight-laced, well-dressed realtor with excellent posture; I’m not sure he’s got the flexibility or versatility to nail ballroom dancing, and that’s to say nothing of his one-foot height difference from Slater. Still, Slater was able to transform a pro football player into a Dancingchampion just last season, and it doesn’t seem likely she’d back down from this challenge, either.

(Craig Sjodin via Getty Images)

Sasha Pieterse (with pro Gleb Savchenko)

Odds: 16-1

Pros and Cons: Here are three words to put in the “pro” column for Pieterse: Pretty. Little. Liars. Even though the Freeform drama ended earlier this year, it’s still got a vocal fandom that will likely benefit Pieterse hugely where votes are concerned. But PLL fans will only take Pieterse so far if she and Savchenko don’t have genuine chemistry — and Savchenko will need to deliver innovative choreography that can take the spotlight off series vets like Mark Ballas and Val Chmerkovskiy.

(Craig Sjodin via Getty Images)

Nikki Bella (with pro Artem Chigvintsev)

Odds: 12-1

Pros and Cons: Chigvintsev has been known to butt heads with his previous partners, and if rehearsals get stressful, that might lead to some friction with a big personality like Bella. But she also brings quite a few assets to the show, namely her insane strength and ability to commit to a character, as she does in the wrestling world. If she and Chigvintsev can channel all that intensity into passion on the dance floor, they could very well make a strong case for that Mirrorball. (Bonus: If Nikki gets hurt, twin sister Brie could always fill in for her.)

(Craig Sjodin via Getty Images)

Debbie Gibson (with pro Alan Bersten)

Odds: 10-1

Pros and Cons: Though Gibson is famous for her late-’80s pop music career, let’s not write her off as a has-been who will struggle in the ballroom. In the years since “Only In My Dreams,” she’s done quite a bit of musical theater, leading such Broadway shows as Les Miz, Beauty and the Beast and Cabaret — so this won’t be her first dance rodeo. If Bersten can develop a solid fanbase in his first season as a professional partner, he and Gibson could be a formidable dark-horse pair.

(Craig Sjodin via Getty Images)

Vanessa Lachey (with pro Maksim Chmerkovskiy)

Odds: 8-1

Pros and Cons: After getting eliminated far too early with Heather Morris last cycle, Chmerkovskiy will certainly be looking for redemption in Season 25. Though Lachey doesn’t have much notable dance experience, Chmerkovskiy is excellent at playing to his partners’ strengths and harnessing the potential he sees in them. If only one half of the Lachey couple can go the distance this season, Vanessa’s chances seem much stronger.

(Craig Sjodin via Getty Images)

Victoria Arlen (with pro Val Chmerkovskiy)

Odds: 6-1

Pros and Cons: Arlen has a deeply powerful story: After living in a vegetative state for almost four years, she has slowly regained the ability to walk and talk; in fact, it was just over a year ago that she could move her lower half again. Though Dancingvoters will no doubt support Arlen during her time on the show, this is Chmerkovskiy’s first time choreographing for a partner with a potential physical impairment. If he can patiently and compassionately navigate Arlen through their routines, their partnership will likely have us reaching for the Kleenex every week.

(Craig Sjodin via Getty Images)

Lindsey Stirling (with pro Mark Ballas)

Odds: 4-1

Pros and Cons: Even though Stirling never pursued professional dance as a career, she regularly works choreography into her violin performances — and she’s got energy in spades, which she’ll need with Ballas as her partner. Stirling’s musicality, combined with Ballas’ originality, could make them worthy winners of the Mirrorball trophy… provided Stirling makes a big enough impact on the viewing audience to stick around. (Judging by the number of views on her “Radioactive” coverwith Pentatonix, at least a couple of people know who she is.)

(Heidi Gutman via Getty Images)

Jordan Fisher (with pro Lindsay Arnold)

Odds: 2-1

Pros and Cons: Season 25 will be Arnold’s sixth go-round as a pro, and she’s reached the finale three times… with partners that no one would expect to see anywhere near the winner’s circle. (See: David Ross.) This time, Arnold is paired with Fisher, who has a far more impressive resume: Not only does he have musical theater experience — including a buzzy performance in Fox’s Grease: Live and a recent run in Broadway’s Hamilton — but his solo music is in heavy rotation on Radio Disney, which means plenty of young voters will be dialing in on his behalf. Arnold has already proven she can achieve greatness with even the most heavy-footed dancers; alongside a young, musically inclined partner like Fisher, she seems unstoppable.

(Craig Sjodin via Getty Images)

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