The lower step should should fold up on to the top of the upper step before you lift and push the whole step in. It looks like you are pushing in the step before completely folding the lower step or do the lower steps not close all the way? If not, some spray lube should help.
The Camping World site for mobile devices does not display correctly on any of my andriod devices. I tried both my droid x2 and my samsung tablet. I also tried opera on the samsung. I had to change the user agent setting in opera to desktop to be able to finish the order. With so many people with moble devices, CW should get this fixed.