First of all, this is not a scripting question but I will offer some assistance.
Yes, ROBLOX Union's physics are obviously not spot-on. There is someone you're suppose to send Unions to if they do not appear to function as they should, sadly I've forgotten the person's name, so if anyone knows, comment it please.
Anyway, the problem is just that ROBLOX Union's are a bit buggy. You can re-union it differently and try to see if the problems is fixed. You could Separate unions until it's fixed.
Also, please try to keep questions for this site Scripting! You should have asked this in the Forums of ROBLOX!
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My email is from a deceased guardian and isnt verified, i cant post on forums