This started happening to my laptop recently - any fullscreen exclusive game seems to run in some sort of colorblind mode, which goes heavy on the blues and very light on warm colors. Windowed and windowed borderless games are unaffected. System is a Dell Inspiron 7375, with a Ryzen 2500U w/Vega 8 graphics.
Not part of overlay programs like RivaTuner, not a part of Steam or similar (occurred in Overwatch), and does not show up in screenshots. It may be at the driver level, but that's not something I can modify as mobile Vega has no access to Radeon Settings for whatever reason.