I have issues since my iPhone 7 with pictures turning into watercolour renditions when zooming in any further than screen size. My wife’s iPhone 7 doesn’t have

I have issues since my iPhone 7 with pictures turning into watercolour renditions when zooming in any further than screen size. My wife’s iPhone 7 doesn’t have this issue. My 11 pro doesn’t have this issue as badly but grass seems like it is replaced by some texture instead of reality. Seems like overly aggressively compression in most cases.