I have a client that is in multiple groups, but does not show up in the user list for any of them.
User does not have a group icon either - where as other people do.

When attempting to add the user again, I receive the message: 'duplicate entry'.
Nothing appears in the server/client log window.

Not sure how it happened (I didn't do it) and unable to re-produce.

Not sure if the client still has permissions from their groups either (user is afk atm).

Sorry for the lack of info