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I had a quest in my for probably a week that told me to complete the dark brotherhood. Suddenly it said i completed the quest and gave me the reward.
I do have premium and the only adventure i've been doing the past month is return to the bandit nest.
Just to check, did you, by any chance, help a friend by collecting a lootspot on Dark Brotherhood? Maybe it was even a few days ago and you'd forgotten about it, and your friend just completed the adventure?
Just doing a lootspot is a quick and easy way to complete these quests. In our guild, guildmembers will usually check in chat if anyone needs a multi-player adventure for a quest when asking for lootspot grabbers...