I’m not entirely 100% sure. I suspect there is something wonky happening with the data being made available from the Blizzard API as I don’t ever physically
remove characters from the DB unless I see they are no longer participating in the challenge (like boosted characters).

In all the reported cases I’ve seen, the character re-appeared within a few hours. If you see this issue, please wait a day or so… if the character does not
re-appear on the list, please contact our Mods.