Problems with A-Chassis

Currently I am having problems with A-Chassis, for my articulated bus.

I guess that the back is not welding properly, and that is why all the parts are moved. The Parts are anchored and the collisions are off.

I have tried reinserting the Weld-Scripts, looking into other scripts that may have caused the problem, but I cannot see anything so-far.

Video of the problem
Output Developer Console (There is nothing on server-side):

And the two errors with MouseButtonClick are not related to the A-Chassis.