For some reason, whenever I press the drop key ONCE, I get the whole stack of items in my hand dropped onto the ground. And, no, my keyboard is not bad. Things that I've done: Upgrade and Downgrade Java. Upgrade and Downgrade JWJGL. Uninstall ALL mods. Start with a completely fresh Minecraft. Change my drop key to D, and back to Q. Upon searching Google, I didn't find many reports about what I should do, so I'm asking for your guy's help!
try deleting the MC icon, and re download it. I have a problem, where when i click on a chest, it acts like a shift click the item, and the only way i can fix the bug is to exit out of MC.