Gravity messed up with vehicles [HELP]

[MileHighGuy]

When the stock vehicles in my map turn while im going foreward they do a barrel roll (when i press ^ and > at the same time). Here is a video: http://www.xfire.com/video/3d1f87/
Help?

[Hardcore]

Well honestly, as far as i know the game doesn't have any real "gravity"

And the best guess i have is that this is some error with the controls of the ship, it is normal for the ships to tilt like that, its just on a much smaller scale, perhaps you have a decimal point on the wrong side somewhere in your files?

[MileHighGuy]

Thats the weird part- I did not edit any vehicles, they are all the stock ones.