unable to invite new members

unable to invite new members they appove it but they join for about 1 sec then they not anymore can someone tell me whats going on?

If the left another Guild has the 12 hour cooldown expired on them?

ok thx..but i don't think they were part of a anther guild but anyway by the time they get on it will of been over 12 hrs so ill see then

this is dealt with they were in a guild b4