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Sounds alot like a draw length issue to me...........
Have you run out of adjustment on your sight to correct the low issue? What is the distance from your string loop to your peep? Are you new to archery? If so are you following your arrow when you make sight adjustments i.e. hitting low move your pin down? Is your arrow set level from nock to rest or does it look like the fletch end is high?
Okay, I was hoping for your sake it was something mechanical we could fix easily but ABSOLUTELY c'mon down and we'll see if we can get it figured out.