Lack of back tension, no doubt. I shoot left handed, shot right for years didn't know why, went to a Rod Jenkins shooting class and he picked up on it right off. Now, when the shot goes right several times in a row, I know why, just start squeezing my shoulder blades together, and that cures it. There are many things that can cause this problem, but if it is all the time with differents bows, its back tension. Try It....RW