Help With Animating Issues

This is an issue ive never encountered before so I have no idea what to do

Basically I went to animate a custom character I made like I always do and it did this?

Heres the rig
Lego Skeleton

Its basically the same as all my rigs and ive never had an issue like this, ive already tried rerigging it and have no other ideas of what to do. If anyone has a solution it would be great! Thanks for reading this far

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