The second vertical has two 3's and no 8's, for example:

     [[5,*3*,1,6,7,8,2,4,9]
      [6, 2 ,4,1,9,5,3,7,8]
      [7, 9 ,8,2,3,4,1,6,5]
      [8, 1 ,2,4,6,5,7,9,3]
      [4, 6 ,9,8,7,3,2,5,1]
      [7,*3*,5,1,2,9,4,8,6]
      [1, 6 ,9,3,5,7,2,8,4]
      [2, 7 ,8,4,1,9,3,6,5]
      [3, 4 ,5,2,8,6,1,7,9]]

In fact, I think all columns/verticals are having duplicate numbers.