I make chunk candles with the chunks sitting on top (bottom of mold) and thought they might spill, never happened with the test burns. I was surprised that they didn't, but when the wax made the melt pool it just burnt like a regular pillar. I can't say much about yours looking at the picture, but if it's anything like mine you will probably be surprised. I think it might have a lot to do with what wax you are using.