Slider not working in secure (https://) protocol

I recently changed the protocol of my entire site to use https:// as I also have webstore. After changing, the main slider on the home page stopped working. On some device is automatically changes to http:// and shows up and on devices that don’t force http:// it does not work (only placeholder appears).
Does anyone know how to fix this issue?

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