Viewmodels right arm rotates whole body when trying to rotate- t

Any help is appreciated!

My Roblox view model i have created using the rig builder has a weird outcome when i try and animated its right arm in specific. it rotates its whole body except the actual arm itself?

I have looked online and i haven’t found anyone who has experienced this. I’ve checked and its primary part is defiantly the root part so that’s not the problem, any help is appreciated!

https://youtu.be/BWzQ3P1vYYE (my problem)

Thanks :slight_smile: