When sideboarding this bug appears a lot of the time, but not all the time. After finishing the game it won't go away until restart. Get it around once per day (play around 5-10 games a day). Started happening around 1 or 2 months ago. I also gotten 2 new to me monitors around that time from my boyfriend. He never had a bug like that and it only happens on the screen arena is on and never in any other game/program etc.

I'm on Windows 10 Home, with AMD Ryzen 5 2400G with Radeon Vega Graphics 3.60 GHz