Chances are you have an extra connection on one of the parts on the right side. You will have to manually check for it.

@hpgbproductions Is there a tool that let's me visualize the mass of all parts at once? I know of the Center of Mass tool, but I can't see the imbalance with that. Assuming it is a mass issue

Check for a mass or drag imbalance. In the normal way of building, the game sometimes gives unbalanced drag. It is also easy to accidentally put more parts on one side