My website homepage BOTH slider (top slider & bottom slider) are not looking good
this is my website. When I visit it, the homepage is not working properly:
1) the slider on the top is not working (when I'm logged and I'm modifying the website everything is ok, but when I visit the website without being logged, it is not working - all black).
2) the bottom slider (where I put the images of my machines, with side arrows and dots, as an image gallery), is not appearing correctly: there is a big-grey-space on the bottom of the first image. When I click the arrow for the first time, the grey-space comes up, and the sliders starts to be ok. I don't understand why!!!
Please help me