Do you have any video of your car? I would bet its Not pulling the wheels out of the beams. My car cannot lift the wheels up out of the beams. Super Gas cars can do it but they have big motors,tube chassis, huge tires, leave at 6000 rpm and weigh 2300 lbs. Your average bracket car will no way lift straight up out of the beams before moving forward. Run some video of your car and it will show alot of what is going on. we ran this one on Lisa's.
http://youtu.be/LWD9sbw_UWk