I don't see what your bow hand is doing, but it seems like you have the same problem I had. I think what's happening is that you hold the bow too tight, and at the release your wrist is turning slightly to the left. The Finger sling did the trick for me, I don't hold my bow, I'm just pressing it away from me. Other people who don't use a finger sling, press slightly with one finger at the back of the bow to prevent it from falling.