Inventory bug in Minecraft 1.17

The inventory bug you are experiencing is probably the result of you holding down your left mouse button.

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To select an item:

Left click a stack of items to select it.

To deselect (place down) the selected item(s):

Left click again in an empty inventory slot.

If the slot is not empty, your selected item(s) and the items in the slot will be swapped.

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To place down exactly 1 item:

Right click.

To evenly spread out the item stack among several slots:

You can hold down left click and move your mouse over several inventory/crafting table slots. This will evenly spread out the stack of items among the slots.

To place 1 item from the stack into several slots:

You can also hold down right click and move your mouse over several inventory/crafting table slots. This will place 1 item into each slot.

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If you hold down left and right click at the same time, this will most likely cause glitching.