Really odd WheelCollider issue

Hey guys,

I have a bunch of spawn points that activate my AI traffic and for the most part it works fine. However, sometimes when the cars are activated, the wheels appear in really odd places, as seen in this image.

Any ideas as to what would cause this? My models are all fine and it doesn't happen all the time, nor does it necessarily happen to the same car twice. I can't get it to happen by manually activating the car.