Can't say I've seen that before. And I've made a few mistakes myself.
Were those each a consecutive pair of shots, with zero shifts of about 1 and 3 moa between each pair ?
If so, the most likely cause is a loose sight or reticle.
As said, you're supposed to be able to shoot without a bush at all. 3 MOA is more like what you's see taking a suppressor off altogether.
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