At first I get the quest from Brotherhood to kill all the enemies in a building of Parkview - done it. After that I was sent to kill all the enemies in a bar Parkview. But the problem is that it is almost the same building, and the first quest I've killed all the enemies in the area. After passing the first quest and get a new (bar) I came to the same place again but only super mutant appeared at the door and a turret - all inside were dead. Again, super mutants appeared on the roof, but none of them had a quest marker. I killed everyone and all within a kilometer - but the quest still active. What should I do now?

P.S. Sorry for my very bad English!