Problem with image carousel on product pages

[flavourboost]

Hi

I am using the Debut theme on my store and recently the image carousels on the product pages stopped working correctly so when a user clicks an image it opens full screen, and there are no carousel controls.

It was definitely working last week so something must've changed to block the JS

Example page: https://boost.simplycook.com/products/gunpowder-spice-mix

Appreciate any help i can get 

thanks

Alex