I've noticed this on a couple of accounts, there are some names I have no idea who they are and when I go to delete them off, they will not be deleted.
I've tried on multiple toons to delete them. Any ideas?
EDIT:
After looking on the wiki:
Banned accounts cannot be removed from Friends/Ignored lists. Attempting to remove a banned account from the list will trigger the "district full" error sound with no error message.
Leads to my next question, if they are banned why are they showing up online?