I just got minecraft back after a long time and I tried moving things from my inventory to my chest or a crafting table but it doesn't seem to work anymore for some reason. I have turned touchscreen off and tried changing keys. (My sneak button is 'Z' because minecraft won't give me the option to make Left Shift a button to do anything at all). 

I play with a bunch of mods as well and I know this isn't the reason it is like this because even before the mods were installed it was the exact same. It's not the biggest issue in the world but I would like it fixed because it slows my game play down immensely.