#1. I assume you shoot left handed, because that is the only way you can "pull" your shots to the right. If, hhowever, you shoot right handed you might be collapsing at the shot, not holding back tension, which can cause shots to go right and sometimes high.

#2. If you're not collapsing then string creep might be a culprit. String creep allows the draw length to become longer, in which case you can't hold the shot correctly. Again, same results as before.

#3. OR, the draw length is too long to start with. I would have very little doubt that this and #2 both apply.