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What you describe is called refraction. By moving your glasses up you're changing the angle at which the light from what you're looking at (in this case the sights) enters the glasses. By changing that angle your eye is seeing the light that's striking the glasses at a different spot. This is why your front sight seems to be moving upward. Just line the sights up again and shoot - as long as the sights are lined up with the target you'll hit what you're shooting at (all else being equal).
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