Weld constraints mess with mesh physics

Whenever i put a weld in the mesh i made, whatever part its connected to gains strange physics properties causing it to fall unnaturally and rock and wobble when it moves.

Left - With weld constraints
Right - without

This happens in all games I have not changed the gravity properties etc.

What is the Weld connecting to?

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The weld is connecting to a non-CanCollide larger version of the mesh.