Hello, I was taking a photo of my gaming monitor and noticed that when I set the refresh rate to 60Hz+, there are bands of black and white horizontal bars moving up or down across the screen. I cannot see them with naked eyes but I can see them through my phone's camera. Is this normal? Is it bad for the eyes or the brain? When using the monitor for productivity work rather than game playing, is it better to set the refresh rate back to 60Hz or I can keep it at 120/144Hz?