I have tried several things without succes, though this just started. In case the problem was a low res image, I switch to a wallpaper that comes from Apple. I turned off focus as some articles say that is part of the problem. I went to settings wallpaper and shut off blur. oh, I restarted my iPhone too - iOS 18.1 - iPhone 16 pro max.
i still have the same problem. Could it be 18.1? Anything else to try?