I would recommend trying a different player model,
this usually happens when the model connects with the player model but the bones it tries to connect to is missing

Some Models are bugged because they are mostly not a Playermodel.

Nut nice Sonic idea

Playermodels should work with playermodels except when they are 'cinematic' models.

1. Try changing your base playermodel between Barney Metrocop and MetrocopFem and see if any of those change it.

2. Add an 'Entity' part to edit your player and set your LOD override to 0. You may also need to do this on the merged model as sometimes bones become corrupted by poor LOD compiling.

引用自 Videogames：

Playermodels should work with playermodels except when they are 'cinematic' models.

1. Try changing your base playermodel between Barney Metrocop and MetrocopFem and see if any of those change it.

2. Add an 'Entity' part to edit your player and set your LOD override to 0. You may also need to do this on the merged model as sometimes bones become corrupted by poor LOD compiling.

That fixed it, thanks for the help!