I recently changed to a dual monitor setup. I plugged it in and used it for several hours with no issues, then after a couple of hours and some tinkering with settings, I noticed that there is now a thin black line at the top of my monitor. The strangest part is when I move my mouse up I can see the space just above the black line is a perfect mirror so I can see an upside-down mouse moving around. All drivers are up to date and I can't find anything similar online. Help would be wonderful!