Moving Items Glitch

In both Creative and Survival mode, I am having problems with moving items around in my inventory. I am not able to shift-click items at all, and I have to hold down my left-click to move items around in my inventory, not the normal click and hover. I encountered this problem after I downloaded a resource pack and installed it into the game. Then I was playing on a 1.5.2 server and the problem started occurring. This also happens in the new patch 1.6.1.