I'm stuck by a bug

[Cantavanda]

Well, I am now in solsteim the island and the big eye tentacle thing killed the old guy from the skaal. Now I have to learn a shout and return to apocryphia to defeat Miraak. But I have all three black books and I have completed all three of them, whenever I get in a book I am in the empty ending room with nothing in it. I have completed the first book I got when I just got it but the mission was to give it to the old Skaal guy. And that's the place where I have to go but I already completed it. It's the place where you have to place for books on those stones. I already learned the shout but the mission is now to learn it. It's confusing and how can I rewind?

[Kaien]

Did you go into your Magic Menu and "buy" the shout with a dragon soul? That's what I had to do.