If it looks correct in GNOME then please briefly log into GNOME and run:
xrandr --verbose > gnome-xrandr.txt
and attach the resulting text file here.
Also if KDE has any monitor colour profile settings then try toggling those.
If it looks correct in GNOME then please briefly log into GNOME and run:
xrandr --verbose > gnome-xrandr.txt
and attach the resulting text file here.
Also if KDE has any monitor colour profile settings then try toggling those.