This may just be me, But on both my PC at work and at home, I get this same issue.. 1 is an NVIDIA GTX 960 and 1 is a RADEON RX 480..
So before anyone says graphics drivers, I have installed both completely upto date, but still get the same issue..
When I drag a window to the top of my screen to expand it to be maximize it, It seems leave a strange white gap at the top. If I press the maximize button, It works fine..
See both are on 2 different monitors, 1 is spotify, 1 is discord.. Do note though, If I drag it to the top again, it works. But drag it to another monitor I get the same issue.
I'm at a bit of a loss on what has caused it.. I know it started after the latest large windows 10 update?
Any thoughts would be great.