Edit: I found it, apparently the list isn't ordered line-by-line, and sdfpubnix was just crammed beside another community name!
I'm not sure if that's a bug or not. I'm joined to the community, but for some reason it doesn't show up in the list with the other ones. Has this happened for anyone else?
To get here I currently click on @SDF in the "about us" sidebar, and then click sdfpubnix in that account's moderated communities list...
That does help! Now I know it's not some global setting or affecting all users. Thanks!