Why isn't my main image changing with different colour swatches?

We just uploaded a new product. I assigned images to each variant colour, but when on the live front end product page and clicking on the colour swatch, the main image does not change to reflect the appropriate colour. Please advise?

https://www.fitflop.co.za/products/adeola-leather-lace-up-derby-af9

The issue is quite serious. It’s not just that you can’t see the color change of the product when selecting another option; you can’t actually select another color or size of the product. When you add the item to the cart, these options are not recorded. It appears to be a theme issue or some code implementation on your end that is preventing the proper functioning of these two selectors. I would recommend checking the changes made in the source code or reaching out to a professional or support service for assistance.