So I saw Hamish (Vagabond) in the list when I clicked "Followed", but Hamish was pretty sure (or at least tried) he also followed me. He might have tried and failed, or maybe my lists are incomplete?
(I also found it hard to understand the "Following" buttons in the right column of the "Followed" list, but they seem to allow me to unfollow somebody in the Following list. Right?)
When I look at the results again, I doubt that I saw a bug or a discrepancy, just the usual difficulties of communication and understanding of something new.