So, I was doing the Lagartija Cave dungeon with a friend, because I needed his help. We got through the whole dungeon, and finished the last boss fight, but I wouldn't let me talk to Selena. Just as I finished the boss fight, the cut scene for the fight appeared on my screen, and my quest arrow claimed that I had to do the whole boss fight all over again before I could talk to her. I logged out, and logged back in, knowing of the 30 minute timer. But I still couldn't talk to Selena, or fight with the boss, as my friend and I already beat him. Can anyone help?
That sounds like a real problem you've got there! If you haven't already, try redoing the dungeon. That will reset it and allow you to fight the boss again. If you have redone it, that sounds like a bug.