Ok: Here are a couple of things. Go into top view and make sure the vehicle is lined up in the center of the grid thing. The grid is like a vehicle spawn, it determines where the vehicle spawns in relation to the vehicle spawn. If it is 50 meters to the right, it will spawn 50 meters to the right. Also, are you sure your wheels are named
hub0 hub1 hub2 hub3 and so on. Make sure no names repeat.