Hi. Yes, this quest is problematic. The issue is that, many players don't know how to do the quest correctly, for example, they don't know that, during "The Attack" part of the chain, that they need to /wave to the guards, to have them leave, and, when they don't, they remain, and when the two NPCs that need to be killed turn hostile, the guards, kill them very quickly, giving no player credit, which in turn, bugs the quest out. If you update the issue on the tracker
http://report.nostalrius.org/plugins/tr ... tracker=14, a GM will reset it, usually within a day.
Regards.