"Skyrim bug scroll (dragon)"

Hello, I have no idea if anyone will see this or even respond to me, but I have a problem. I'm playing and I retrieved the ancient scroll (blood), but I noticed after finishing that I still have the quest and I’m missing the dragon scroll. There's nothing on the map, and I don't know where it is because I didn't sell it or use it; it literally disappeared. So I don't know if anyone could help me or if I have to start everything over.