I don't make candles but buy a lot of them. Some friends and I got some tarts that are doing a very funky thing. Once melted the wax is creeping up the sides of the container and drying out. It looks like vomit, and it smells off too. The tarts themselves seem dry and a bit flakey. Any ideas what's happening??? These are a parrafin blend. ETA It almost looks like it's the FO left in the bottom after the wax creeps up the sides.