I found I was getting "anxious" and what I was doing was trying to move the bow out of the way(unbeknownst to me at the time)to see the arrow hit the bull. Of course, the arrow was hitting everything but the bull. Make yourself be still and watch the arrow "through your peep". I am betting you are not holding still at the shot. Another thing I found was I was not concentrating on the target, the "spot" I wanted to shoot. My mind had 100 thoughts running through it about making the shot and what I needed was to empty my mind and just "see the target".

Hold your body and your mind still until you hear the arrow hit the target. Once you do that you'll see what I am talking about.