Club requirements changed?

I have many clubs, they are such a great feature! Setting the requirements for joining both adds to the club identity and makes it easier (and quicker) to find the better sim/club match. Something fees a tad different though, as I missed something changing. I created a club where one requirement is Singing skill, but sims with zero such skill are able to join. I don't recall having this happen in the past, but maybe I never required this skill. What I would like to know is if there were some recent changes that I missed? Can your sim join clubs that should be closed? The only mod relating to clubs is the old "more club icons" which I think is just graphical.