Just looking at your top line, I see that in the middle box you have "983". However, puzzle #76 has ". . 8" in the corresponding place. In other words, you have got a 3 where the puzzle has an 8-clue. Clues cannot be moved around, of course.
So it means you have solved a different puzzle to the one set in the book. Perhaps you copied the puzzle onto a grid somewhere, and in doing so you omitted the 8-clue in the top line (or put it in the wrong cell)?
(I haven't checked the rest of the puzzle.)