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If it's consistently going up to the right, it's probably your sights that need adjusting.
If it's inconsistent groupings you could try a variety of things, mostly to check if anything is broken/damaged.
Turn off the hop up, take out the inner barrel and see if it is bent/warped, look in the barrel to see if it's scratched inside, etc.
If you're testing if your sights are zero'd while standing i'd highly recommend you do it proned with the magazine on the floor to minimize human error and movement. There's a good chance you're missing just because you're not shooting properly.
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