Kris, it could be a number of things. The first thing I would look at is how much trigger finger you used. Too little trigger finger causes the tip to push the gun to the left if you are shooting right hand, too much pulls the gun to the right. You could have too much trigger finger which can cause the wrist to flex in an attempt to help you pull the trigger all the way through, causing your shots to go right. It sounds like whatever you were doing was the same for all your shots, so whatever it is you are doing, you are consistent at it. Go back and pay close attention to the basics such as grip and stance, and when you get ready to shoot, where your trigger finger is on the trigger, and see if that doesn't help.