How did you get all the mines to 10? There are only 10 mines you can place on the board, but 12 spaces between 1 and 10. I think you played something wrong. When you place a mine on the board, you move it up the track one SPACE, not one VALUE. So after #8, if you place a mine on the board you move it to the empty space between 8 and 9, not to 9 itself.
You're right, we played that wrong. But ok, then they all ended up on 9? That makes absolutely no difference.