Why does an object with no collision have effect on other parts?

Edit: So the previous post was me trying to figure out why the wheels kept flipping, and I found that it was the mass part that had no collision but when resized stopped the wheels flipping. So did the weld constraint have something to do with this, or is there something more that I didn’t understand?

After following this wonderful tutorial: How to Rig a Car - Resources / Community Tutorials - DevForum | Roblox
I came across a very annoying problem, the wheels like to flip:


After 4 hours I found the problem occurs with the mass part of the vehicle, which is the mass of the vehicle.

The mass part is the only part in the model that has mass, and it has no collisions, but when I remove it, the wheels don’t flip and have normal suspension. The mass part has a weld constraint to the platform part where the constraints are added.
No Mass Part:


With Mass Part:

(Don’t mind the brick in the middle its the platform and has no collision)
How would I be able to fix this problem without removing the mass part?

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If any more screenshots are needed or more specific details, please reply here.

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Decreasing the size of the mass box removed the issue, but now my question is why did this have any effect if there was no collision in the mass box, would the weld constraint have anything to do with this?

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