An object connected to a hinge doesn't completely face down when it should

I am working on the cars to a Ferris Wheel. I made a hinge so the cars will always face down. However always point at an angle instead of straight down. Do you know how to fix this? I’m not the best at hinges.

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It looks like the only problem is that there isn’t any weight being applied. The sides of the joint are rubbing with friction, you could either disable friction or add weight to the part, maybe by attaching a seating compartment to it.