What arrows are you using and what is your draw length? My first inclination is to see how your arrow spine matches up to the bow. My second is to see how the nock fits your string, and the third thing that I would look into is how clean a release you are getting. This is a short bow, and you may have some interference from finger pinch going on.
As an exercise, try drawing without touching the arrow nock with your fingers...that's right, spread them apart and try not to touch the nock of your arrow. See if these ideas have some merit. Inquiring minds want to know!
Killdeer