One method to fix this is to remove one trait via cheat with "traits.remove_trait (trait)".
Then you add the "wrong" trait (from which you get the wrong buff) with "traits.equip_trait (trait)"
And then you remove the "wrong" trait. It should not appear anymore then.
This issue occurs if you edit the traits in CAS with cas.fulleditmode, because you remove / add traits in CAS, but only visually.
The cheat method is the method to also get rid of the "wrong" moodlets for the traits which the sim does not have anymore.
