Im not sure how to describe what im seeing so i will try my best. It looks like water ripples in the sky and whenever you move around in a map or move your mouse cursor they are always moving/changing so its very distracting when playing.
Right click the picture below and open it in a new tab otherwise its hard to see what im talking about.
It may look better or worse depending on your monitor. You could try adjusting your monitor’s brightness and contrast settings to see if there’s any difference/improvement.
I had to look up what colour banding is because i have never heard of it before, I asked around my group of friends and everyone i asked said they are getting the same distracting weather effects when playing specific maps. This only started happening after the fifth anniversary event went live so i assume it will go away after the event ends?