Why does my rig do this?

I simply want to animate my rig. It works just fine in the animation editor, but when i play it, the shoulders split apart like so:

image

It does the same thing with the default roblox rthro rig (thats a toolbox rig ^^^)

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I have tried getting rid of roblox’s native animation script, but this simply results in the character loosing animation (which was expected), without the inteded result of proper arm placement

This is the correct category right? im pretty sure art included animation (although the problem may be with the motor6d, so that may cause it to fall in another category)

I was manually setting the c1 of the motor6d via script somewhere. i have fixed it (my bad xd)