Strange car physics problem

Hey forum

I’ve got a car with all of the body parts welded to a base, connected to the wheels. As you can see between the Client (first) and server view (second), there is some miraculous effect happening when the car gets unanchored. The server view is accurate, the parts are in place as they are when they’re welded.

I can not figure out for the life of me what this is about, or how it 's possible the server is seeing differently than the client.

Any help appreciated