I want to click an item and get 1, but it gives me 64 or 16. Then when i go to remove these items from my inventory, they completely disappear. I do not know what is happening, so please try to fix it as soon as possible. Thank you.

Put the summary of the bug you're having here

What I expected to happen was...:
I would grab 1 single item.

What actually happened was...:
It grabbed an entire stack of this item.

Steps to Reproduce:
1. Grab any stackable block.
2. Right click and left click that item.
3. It should give you 64 or 16 of that item instead of 1.