Since this isn't easily reproducible I will tag this as Needs Input to see if anyone else has this issue.
So far there are no me toos.
I clicked "Me Too" even though I'm not sure I'm seeing the same thing.
My Celebrities with 4 quirks enact behaviors that are associated with quirks they don't have. For example constantly playing with their phones, checking themselves in the mirror or getting the close to a celebrity buff. I don't know if this is a bug or just part of the fame/quirk system. Maybe Celebrity Sims are pushed preform these actions because that's how they get quirks.
Bit annoying, though.
If it helps, I encountered this issue after using "Quirk B Gone" to get rid of the Stan quirk. I now have a 5th quirk slot that glows red when I open the fame info tab.
