I understand your frustration. I was trying to understand what made this happen too. I don't have the issue myself but wanted to understand what caused it. (I can't remember if I was ever able to get it to happen or not.) I believe it has to do with the way you hold things when you join to work in the round. Find a good video that shows how to join the yarn for working in the round and follow it very meticulously and maybe that will solve it.