Issue with slider on front page

We've seen this before but can't seem to solve this. I need to have the header images and text appearing but all content appears on Front page. Something to with slug, can't remember and unfortunately not well documented or self-explanatory...
http://www.hetrotterdammertje.nl


appreciate your support

Hi,

Could you please provide me with a URL to your website and back-end access via PM (click the “Private Message” text underneath my avatar) so that I may analyze it?