Put the summary of the bug you're having here

What I expected to happen was...:
I expected to be able to click on items in my inventory freely, so I can switch items from my inventory to my toolbar. This bug only affects items in the inventory. When i place my cursor over the item, I am unable to select it. The cursor appears over the item I wish to select, but a different square is highlighted. The highlighted square's item cannot be moved either. This has proven to be a major issue during combat, especially when my sword has broken. Please note that I do not have touchscreen mode enabled.

What actually happened was...:
Describe what happened here

Steps to Reproduce:
I am not able to give you an exact list of how to replicate this error. I have attached screenshots that should be able to help.