Had this happen to a guildmate, they apparently were able to be invited once but never again, and even after accepting it it did not move them into the guild, also appeared offline despite being online, they cleared the raid with us no prob, not sure of the resolution but you can probably put in a ticket or maybe the guild leader or an officer? Don’t want ticket bloat though, so one is probably plenty.
Stop trying to delete alts while drunk and or sleep deprived. that goes for me especially!