I haven't removed anything,have just played round with it a bit, to see if I could better the situation. Your explanation is also plausible, I don't know at what point of production they glue in the formers. It might indeed be that the fuse wasn't hardened out fully. However, whichever is the actual cause, it doesn't come from temperature differences and therefor it's not neccesary to be surprised by alledged missing knowledge about materials
It's 19:20 here now, gonna have dinner first, but will make some pictures to illustrate what other points I have found.
I can't emphasize enough, it's not that it's bad, or crap, or anything like that. It's just that for that pricetag, it should have been finished better.