It probably has something to do with WQ and Carbonite trying to parse them / draw them on the map, I know the emissary quests appear in the quest log, but they are not real quests and should not be there, nor should they be in blizzards quest log, but they show up in the watch "x/4 world quests done" for each faction available.
The issue trying to find the problem and fix it is on my 110 it's never happened and hasn't happened
I'm leveling another 110 now to try and get it to happen (109 so hopefully by end of weekend)