I had a weird thing happen with some of the candles I made for Christmas this year. As the candles burned down, instead of the wicks burning away, they would just char but still be there. They would get longer and longer until the flame was really high from the long wick and the candle was no longer burning correctly. On some of them, the wick even blew up, not like a bomb, but like a balloon. I have a picture attached of the worst offender. I'm really confused why this happened because this is the exact same wick I used last year for Christmas candles, it's even the same batch of wick. Anyone have any ideas why this would be happening?