Creating stairs

[Edmar cortez]

Hi, im doing the tutorial and im having an issue, in the video and the final render on the tutorial page the top appears flat, but when i do the excercise it doesnt get stepped, im following the tutorial as it is and ive already tried diferent methods and nothing works.
 i attached the excercise as i did it, and the one on the end file i downloaded from the tutorial page.

Hope i can get help, ive been postin the last 3 days and i havent get any of my questions answered.

[Rokas]

Please attach max files to Your questions. It nearly impossible to diagnose some of the problems without max files.