I notice this as well. It happens mostly when I am not keeping good back tension on the bow arm. I think this causes a slight alignment error to the right which is compensated for by shoulder muscle tension. As I loose the arrow, the bow will move to the left and the arrows will hit left. I try to keep the bow arm still and the arrows center up at longer ranges. I also notice an over draw tendency at longer ranges which puts a kink in my form! I shoot blank bale and look at my arrow on the bow to see which way my bow arm jumps when I loose. If I can figure out what is causing it, and correct it, I shoot straighter! It really seems to help with my form. Good luck! Moebow is right on track as always! Ollie