This is a sign of bad form. If you have good form, this will not happe, no matter what the brace height is. I would either talk to some local " pro" archers in your area or go to a pro-shop and ask them to help you and see what is wrong with your form. If you don' e want to do that, have someone take a few pictures of you from different angles at full draw and post them on here and these guys could help you out, but the first method I suggested would be better.