Act 2 issue

During act 2 when you rescue the group of tieflings from moonrise if you had already spoken to the older brother he won't be there when you return to last light. At this point I found him close to moonrise being attacked and saved him in which he returns to last light. You are meant to do this first but I missed him and did it after. This results in all 3 of them stood at the bar in last light asking where the others are in conversations despite being literally next to each other so you can't complete the quest and get the reward. The fix is to exhaust the dialogue then long rest at camp and return.