Blender Child of Constrant Having weird results when importing

So im having problems with Blender to roblox of a port of a gun from gmod that was modified to have roblox arms by using the Child Of object constraint
heres my settings
image
Heres what it is supposed to look like


heres what it looks like with anim

dont mind the spaghetti arm, thats not the problem
but can someone please help.
the anims work in blender but not in roblox
im exporting to .fbx and importing in the with Avatar / Import 3D
pls

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