Feature Slider keeps disappearing

Hi!

I have a problem with the Feature Slider on my website. It showed the very first time the website was loaded but once I started clicking through the top level navigation and then returned to the home page, the Feature slider was gone and did not even return when I did a page reload. The browsers I use are Firefox and Chrome.

The slider dissappeared from an older website where I use this theme as well when I deactivated and reactivated some plugins. I could not make it return so I set up a testing environment where I installed the theme with demo content once more to see if the Feature Slider problem could be solved this way. Turns out I have the same issue straight after installing the demo content.

Can someone please tell me what is causing this and how I can fix it?

Thank you!

The page I need help with: [log in to see the link]