Alien Skin colours missing from CAS

I have just tried the game and I disabled all mods in the game. Went back in and they're 4 extra colours - none of which are the purple, blue and green alien colours.

Put various random occults into CAS, mermaid in mermaid form brings up colours, vampire in vampire form brings up colours. So in any kind of human form the colours do not show.

When I looked at aliens in alien form - all the blue, green and purple colours came up. So it must be a mod that's blocking them - but it's funny they don't show up for all humans and occults in general?

At a guess what kind of mod would effect skintones? I have a few but not skin replacements. Feet replacement, some sliders, skin overlays

Thanks for your reply