Same issue. Shows chapter 7 complete but not chapter 6
EDIT : Oddly, my achievement for Chains of Domination shows that I’ve completed both chapter 5 and chapter 6… so this may just be a quest log display bug. I opened a ticket as well, though, just in case.
I’m having the same issue. Shows chapter 7 completed but not chapter 6-
I am also having the same issue. Chapter 6 not showing as completed but Chapter 7 does show as completed.
Same here.
I just went to wowhead and stepped through all the quests that are part of “Unseen Guests” and used their questid macro to see if I had all the quests in that chain complete. It seems I don’t have completion status for the 3rd step of the quest chain, “The Dawnkeeper Prisoner”, where you go talk to the prince about Sire Denathrius. It’s just a “go talk to him and hand in the quest” type of goal, though, so not sure how I couldn’t have done that.
Might be on that quest where the bug exists.
EDIT:
I went back to Revendreth and all the NPCs associated with that quest are (not unexpectedly) no longer there, so it’s not something you can go back and do if you didn’t get credit for that quest.
The bug might be that the actual achievement just checks the end-of-series quest for showing completion, where the quest log tracker checks each quest in the series for completion before showing credit.
Can you tell I do a lot of coding/debugging of my own? 
Check the Achievement “Chains of Domination” if “The Unseen Guests” is marked as complete you’re good.
I also am having this same issue. My quest log does not check “The Unseen Guests” as complete, yet my achievements page “Chains of Domination” has “The Unseen Guests” as completed.
Thank you. Yes, “The Unseen Guests” is marked as completed in the achievement. Maybe Blizzard will fix it in the list that you seen when in map mode.
Same issue as everyone else, do we have an update on this issue?
same issue here, just finished power of night but unseen guests is still not ticked off on my map log despite it being completed on my quest achievements.
I’m having the same issue as well. Just finished the power of night chapter.
Same issue here… achieve shows it is complete but quest log only shows me 6/9 chapters with Unseen guest incomplete.
Have this issue as well, achieve shows it done and did next chapter but map story chapters shows it white/incomplete.
Yep same issue here. I got the renown reward, but the completion in the Campaign Journel.
Yeah… same here. I’d like to add my name on here to same I’m bugged.
Also bugged. Just got credit for The Power of the Night after completing it and it still shows incomplete.
Same here. But I’m able to advance to the next chapter 
Same problem as the rest of you and this has got to be the cause. A lot of people saying it worked fine for alts but not their mains. Characters that hadn’t defeated Sire first were forced to watch the post raid cinematic as part of the Unseen Guests quest line. Characters that did defeat Sire skipped that step. I’m guessing those of us that got to skip that step also missed getting that quest flagged as complete as a result.
Having the same problem here.
Same it shows as it being unfinished in the Chapters but I just finished the campaign for Power of the Night for Ardenweald