Homepage Slider Issue

Hi, everyone, just take a look at the slider on homepage here how weird it is changing http://www.divalgoni.com/. I just want it to slide like on original one.
Original template is named Slider Responsive Theme, here is the link to see http://www.dessign.net/sliderresponsivetheme/
I’m not so good in css if that is problem so it would be great if you explain me detailed what have to do to fix it 🙂 Thanks guys