Aircraft falling...

Ok, working on the Cheetah CFG contact points, I have a problem that the aircraft "falls" to the runway everytime I load it. My contact points are spot on. I know this, because I added temporary lights in the cfg and altered their position until it is exactly under each wheel. then I changed the contact points of the wheels too the same as the lights.
but despite of that, it stll havee the same problem. it is like the aircraft is loaded at a different height and then drops to mother earth
any idea why? dont have this problem with any other aircraft
but despite of that, it stll havee the same problem. it is like the aircraft is loaded at a different height and then drops to mother earth

any idea why? dont have this problem with any other aircraft