You know banned RMT accounts don't get labeled (Deleted) right? at any given time 10 RMT on your Blist removing them from the top since new is added to the bottom. Whoever keeps filling their blist with RMT without knowing that SE does not (Delete) accounts that are banned nor their character ether just don't know this or are are just to lazy to clean their blist to add more and just want to complain about it.
Clean your blist to the most recent 10 then you be fine. Have fun cleaning though, it takes awhile to remove even just 50.
And now the "Why didn't you use the search function? There are already a dozen thread buried in here with this same topic."