As I look at this wallpaper on my iPhone X, I'm not sure what you are describing as an issue. It seems in the are that you have circled the color changes from orange to a slight pink shade. It is the same on my iPhone X. Seems to be the coloring of that wallpaper.
Apple Event: May 7th at 7 am PT
2 replies
Why don't you change the wallpaper and find out...?
IPhone X wallpaper problem or screen problem