When I right click on the task manager, either on the bar itself or on an app icon (I mean the icon for a running app, I don't know how to call it), the option menu opens normally. The problem is that it won't close if I click outside it or if I right click again. I can also have multiple of these menus showing at the same time.

The only way to make it go away is to click on one of its options, then it'll close.