There is this strange glitch where you sometimes open the inventory and without pressing shift, your items randomly fly in and out of the hotbar into the inventory. This happens on all game modes.
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duplicates
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oh, how do i remove this post then?
kumasasa
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Sometimes I even have to hit the right shift key even though I never use it while playing.
This has been posted before, and is a duplicate. Try hitting shift again or some people have said that F11 works.