Party Finder: I'm doing it wrong?

[Elim]

When I uncheck(aka un-highlight) a class that can join my party in the Party Finder, they are still able to join. For example, I unchecked Thaumaturge, Arcanist, Black Mage and Summoner in ALL the DPS spots left yet they were still joining.

Am I doing it wrong? Do I not understand how this works? Is there a glitch? Not sure what's up.

EDIT: Oops, posted this in the wrong forum. Oh well.