Yep, and you can still get there with the mouse cursor? What happens if you pin the window with super+arrow keys up, down, right and left? Does it then close flush? Have you tried another global theme?
Yes, sir! All support units have been informed and will present you with a solution as quickly as possible 
You neither write what you have tried to troubleshoot so far, nor do you provide any information when asked…so what do you expect 
But wait…I got it: your flux-compensator is broken 
Then it can’t be that important…