oooohhh... I just went back to look (I just installed a new map that had some other stuff in it) and I saw the map name on the list, which made me realize that the loaded pk3 files affect what shows up there.
I remembered entdefs.pk3, and looked but it was there. The file size was 0KB though so I reloaded it and now it's problem. Dunno how I ended up with a 0KB entdefs.pk3 though. Weird.