Any one of these things will make me shoot to the left:
1. Not tilting my head enough to get my eye over the arrow.
2. Using my string hand and arm to draw the arrow rather than my back muscles.
3. Not relaxing my string hand and arm, which is another way of saying #2, I guess.
4. Shooting with a straight bow arm.
5. Using a thicker than usual shooting glove, or a deeper hook in my string fingers, that causes my anchor to be further to the right than usual. This is something you can get used to, in time, but will initially cause you to hit to the left.