Map Probems.

I have recently finished making a map for destruction but for some odd reason every single time i spawn a vehicle it goes flying into the air and then comes back down crushed. I have moved the player spawn point but it still does that in the same place it did the first time. So if someone could help me with this problem that would be great.

 

I am not sure but that usually happens when there is no solid ground underneath the vehicle.

 

No its solid. I used create blank terrain tool and then made it all grass. I used that with a different map.
Do you think its the water?