I've just started working my horse in an english saddle (crosby.. maybe all purpose). I'm having some major problems at the canter. My legs will literally swing forward with the motion of the canter, sort of moving me into a chair seat at certain points of the stride. It's not just my lower leg, and I made sure I wasn't pinching anywhere. My weight is in my heels, etc.
Also, I fly up a lot when he canters. I have to slow him down quite a lot for my butt to stick.
Now that I think about it, even in the trot I feel like my toe is a little farther forward than it should be.
I take lessons weekly, I've never had this problem.
Could it be the way my horse moves, my saddle, or myself?
I can try to get a video if necessary.