I just made a new world and had been playing for about 4 Minecraft days when the bug occurred. I am currently unable to move items from my inventory into my hotbar. I have tried selecting the item then dropping it while having an available spot in my hotbar for the item but when I picked it up it went right back to the inventory slot it was previously in.
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I believe this may be a duplicate of MCPE-65815, although I'm not too sure as the descriptions don't match up exactly.
This is a known issue but I'm not sure which number it is. It happens because the block stack realizes it's got the wrong number, but doesn't know how to fix it. Regardless, the way to fix this is to either:
Wait for the problem to go away (This is the only method if the item stack is not in your hotbar unfortunately, other than leaving the world and coming back.)
OR
If the item is in your hotbar, try placing the block. It will place, then disappear. Right after this, the stack is forced to update meaning it will show the correct number of items for that block.