At least it appears that they aren't I've faved 8 or so servers and they rarely show up in the Favorites tab Didn't check if filters were being applied, but if you ask me, filters shouldn't be applied to Favorites
Filters are applied and if it goes by IP address it's possible the hosting service changed the server they were hosted on and ruined everything.
I'd care if I could favorite a server while IN the server. How am I supposed to know if I like a server before I join it, or remember it when I'm done for the night?
