citizen happiness, "We hate our culture"

Published on Saturday, February 19, 2022 By Philocthetes In Galactic Civilizations IV

Hi all. I'm around turn 380 and have just noticed a core world where the citizens are saying "We hate our culture" for -6% Happiness.

I have no idea how I could work to reduce that. Is because the world is mostly developed (26 of 37 tiles built) and has no Culture improvement? Population is 10/22.