FLUX KLEIN makes invisible weird darker/lighter patches (Only visible when I tilt my laptop screen past ~120°)

I have a weird issue with Flux 2 Klein's output. At a normal 90-degree viewing angle, the backgrounds look perfectly clean and solid. But when I tilt my laptop screen back (~120-150 degrees), a lot of "patchy" darker and lighter areas become visible. (Please check image 2) - It’s not the screen itself, because images from other models don't have this (image 3 is from ChatGPT with clean background). - I've tried multiple different workflows from RunningHub and Youtube so it's not because of my settings or any particular node in the workflows.