Sybille Stentor gave me the quest Kill the Vampire some time ago. Quest is simple; go into Pinemoon Cave, kill vampires, happy times for all. Then the Dawnguard Gunmar gave me the Quest Cleansing Light. This was a considerable amount of time later. The location? Pinemoon. I looked for the quest from Sybille....but it wasn't in my log. I completed it anyway and reported to her but she had no dialogue options about the quest. I used getstage, find out it's at 0. Setstage isn't affecting the quest. Is this a bug or what? How come this quest is just....gone?