I already tried a few themes, and ended up using the one from Paranormal. The same issue existed on all themes. You can see how the white color looks black if you change the angle. The real colors are only visible if I'm looking from the top of the screen. Even when looking at the screen at 90 degrees the colors are way off.
The device is Rebel Vape, 21700/20700 single battery, non squonker.