@Mlynn360 Yes but he killed up to nazgrim heroic and is trying to join a malkorok normal group as is clearly visible in the screenshot. Which causes no conflict with his unique heroic ID. I think it's what tiny said which is that the RL is saved 7/14 while mwlady386 is saved 8/14. Even though the RL has made a group to do the 9th boss he hasn't killed nazgrim himself so the add on prevents you from joining.
Is there no work around for this? It happens a lot