Ok, I'm not going to blame it on the stirrups or the horse or whatever. I know it's 100% me. But I can't keep my feet in the stirrups when I'm cantering!!!! I don't know what's wrong, I just can't. I balance fine without them, it's not a problem, but I should be able to keep my feet in the stirrups! Any tips or suggestions as to what's causing this?