When you hover over an item and it's tooltip comes up and then you close your inventory then open your inventory back up, the tooltip will be shown until the mouse cursor is moved.
Environment
Mac OSX 10
When you hover over an item and it's tooltip comes up and then you close your inventory then open your inventory back up, the tooltip will be shown until the mouse cursor is moved.
Mac OSX 10
Can't reproduce in 16w43a