I just went out in the yard and tested mine as I ran into this this past season as well. But I figured out what I did quickly. I didnt have my rope cocker rested on the back of the bow evenly and when I pulled it back, I was a little off center. I just deliberately did it in the yard and I was way off at 25 yards on three shots. I had the string about 1/4"-1/2" off center. I then fired three when it was cocked perfectly and I hit the three shots in the size of a quarter at 25 yards. Maybe you bumped a limb while going into the woods and the string shifted when you did? Or maybe you drew it back off center.