I would think that maybe you bumped your bow or something. If your bow was set dead nuts last time you shot it now all of your shots are too far off to one side you may have knocked your rest out of alignment. I had a similar problem with my bow. Great groups but my bow shot 4-5 inches to the right and was out of travel on my sight. Took it in and found out that the center shot was almost a 1/2" off to the right. Had that set to center now its perfect. Another quick thing is that your pins should all be inline with each other. you should not have to adjust right to left when you move back at further distances. If your dead on at 10 yards you should only have to adjust for elevation as you move back.