Inventory Left Click not Working

Whilst in the inventory screen, or an interactive GUI (chest, furnace, etc.) I am unable to use my left click button to move around items. If I spam left click and move my mouse around though, it has the off chance to move some items. This to me means that the left click should be working, yet it is being blocked or something. This occurred when I took a backup of the world, and updated to the 17w06a snapshot. When reverting back to 1.11.2, it still occurred. I deleted the world folder and replaced it with my backup, but the issue still occurred. When not in an inventory screen, however, left click works to destroy blocks.