Defend a Survivor Quest not giving reward

I can't remember whether I've completed this quest or not.(Either I've finished it and the game hasn't registered it or I haven't and I'm unable to complete it.) But when I talk to the survivors it doesn't prompt me to do the quest the NPC's just say 'And the Essence is ours all thanks to you Realmwalker' But it does not show as complete on the map and the Essence bundle has not been released on completion of the task. This is in an untamed antequarian swamp realm. I have not had this problem before in other untamed realms or any of the story realms.