I just started flying my bobcat and the nose retract starts to go up when you retract them and then comes right back down . The mains are working fine . I am using a robart vr control Valve
This one has me stumped. Thanks Randy

Check the air cylinder on that retract. I had this same problem earlier this year and it was a bad air cylinder on the retract.

You may have a leak on the piston o-ring.