When using the editor to modify a pawns favourite colour, upon selecting a new colour, it will take affect and the colour will then give them the mood bonus from dying to that colour and it be the correct colour etc...

BUT
It will seemingly randomly shift a random amount of other pawns favourite colours to random florescent colours as a result. then if you change their colours back to normal it changes others pawns colours etc... Like whack a Mole with no way of getting it all worked out.

I play a mainly vanilla plus game with only a few QoL mods or additional hair styles. So I don't think it's another mod doing it