Ever since about 3 months ago i have been having alot of problems with shift clicking items in my inventory and while crafting.

Well for the past few months I have been unable to shift click items back and forth within my inventory and while crafting which is very annoying. Whenever I wish to move items in my inventory I have to drag them rather then just click on them. I also cant swap items in my inventory with this glitch making it very hard to make fast swaps while building or fighting mobs/players. please help me fix this.
-yours truly Gigantic_Man