ORIGINAL: Exocet77
I was finding the same problem, shooting a little low to the right when shooting free hand. I figured out what it was. I wasent following through on the shot. Just as I squeezed the trigger to shoot i was simutanesly already dropping the bow to see where I hit. Once I started following through on my shots this corrected the problem and I was hitting accuratly. Hope maybe this helps
This could also be the rout of your problem. Remember to hold the bow on target and try to see the arow through the sight hit the target. This will make sure your bow does not move before the arrow has left the rail.
Good luck.