Yeah, that's not good when that happens.
The word pucker just makes me laugh. I'm not laughing at your issue. No, not at all, I'm just browsing and that word is so silly to me.
I'm one of those people who can "taste" words and see color when I hear notes. It can work like a swinging door though. Even good things come with some kind of con.
Anyway, I never had this pucker with zipper issues but it sounds like a quality issue. That is to say, the item sound like it needs to be higher quality. Hope they fix it quickly for you. Sorry for your trouble.