PetVille 24-Hour Heart-Shaped Candles mysteriously appear

When we opened up our inventory in PetVille, we noticed that there were five 24-Hour Heart Candles there -- and we have no idea how they got there. Is this a glitch of some sort or maybe just something we haven't noticed before?

We decided to check out one of these candles, and when we set it on the table the room went dark, except for the warm glow from the candle.

If you know anything about these heart candles, please leave a note below!