ThetaArgolis: Having some issues with this quest..

Met with Tristian in town, talked with the girl, got invitation to attend meeting, went to meeting with Tristian, they attacked, I defeated cultists (except those that flee), leader guy gets back up and disappears into portal, quest notification comes up saying Deal with the Cultists but it doesnt tick off that Ive dealt with the cultists.. Ive travelled back to town, nothing.. tried talking to Tristian, nothing changes..

I even reloaded a save back before I had been there, and it still happens..

This happening to anyone else? Will the quest eventually tick over or something? Any suggestions to help?

Thanks alot

InEffect: the quest doesn't close properly. It won't have any adverse effects and tristian story will continue as normal.