Nostalrius Begins - Quality wow vanilla realm (1.12)

The ability for me to be invited to a guild seems to be glitched or something of the sort. When someone attempts to send me an invite - it tells them I've already been invited to a guild... However, I'm not currently in a guild (as clearly stated when trying to employ the /gquit command).

Are there any suggestions for how I might remedy this situation?

Also if the guild that is trying to invite you has 321 members, they can't invite anymore. They be full yo.