I agree with the previous post. But I would tend to lean more to something shifting/moved. At 25 yds, it would take a drastic change in shooting form. When I come to full draw even on a target out to 30 yds, I am relitively close to being aligned before I start pin point aiming. It would be relatively easy to notice if my sights moved that far off. Now a movement of the rest would be different and something I wouldn't notice.