I've never had this happen. It's probably a low quality system if that's happening. What type of base are you using? I take it you're using a lace base? I always wash the hair system when it's on a mannequin head or attached to my head, so if you do that then there's less chance of any hair coming out from the 'wrong side', although it shouldn't be happening anyway. However, I now use a skin base (with a small lace area for the hairline), so this is even less likely if not impossible to happen with skin bases.