A Candle Curiosity

One day during the winter months, I noticed that something strange had happened to a candle in Grandpa's living room. Grandpa loves to have his fireplace going any time that it seems cold outside. With that constant heat along with the heater being on, the candle eventually couldn't take it and just slumped over with exhaustion! We should probably replace it, but it's such a great conversation piece that we haven't been able to let it go yet.

The candle:

The culprit: