Same happened me a while ago.. I wanted my noob to join my Guild so, I logged my noob in klicked on Guild->Join->klicked on my main.. but then I had to go afk, so after 30 minutes I came back I clicked Ok on my main, but the noob wasnt in then so I checked on my noob, voila it says something like " Bla bla invited you to join his guild"
. But that was ages ago may it was a bug and has been patched, so dunno.
