Slider only works when the refreshed button is hit

I have a slider on the home page of my website and it works when you arrive on the site. However, if you visit any of the other pages and then return to the home page the slider images don’t show up unless you refresh the page.

I have tried playing around with both relative and absolute references (index.html and but neither seem to fix it. Any ideas?

Here is the page

The slider works fine for me in all circumstances. What browser are you using?