Slider - Alignment

Set the initial value of slider to 0. Then drag the left mark to where the thumb on the slider is. Set the initial value of the slider to 1 and move the next mark. By the time you get to 10, you will realize you don’t have enough marks.  The issue actually is that you have 9 spaces, and 10 stops on the slider. (You need a start mark, and an end mark. Between them, the slider moves 10 times, so you need 10 spaces between those marks. Count them, that's 11 marks)

According to the picture, what you are missing is the 11th mark.