Maximizing undocked game tab (Windows 10)

Hey guys,

I'm having a weird problem and can't quite figure out how to solve it!

I'm working with 2 monitors and sometimes I drag my game tab to the secondary monitor and maximize it.

Since a few day ago, everytime I maximize it, the window resizes to a MUCH bigger dimension than the screen itself. It used to resize to perfectly fit the monitor...

I had this problem in windows 8.1 also, but it fixed itself eventually.

Anyone had this problem before?