There are a couple other threads about this bug. It seems to be an issue with the quest tracker. https://us.forums.blizzard.com/en/wow/t/chapter-6-91-campaign-completion-credit/1041814/54
There are a couple other threads about this bug. It seems to be an issue with the quest tracker. https://us.forums.blizzard.com/en/wow/t/chapter-6-91-campaign-completion-credit/1041814/54