Product Variations Add to cart JS issue

I’ve got a bunch of JS errors dealing with the product variations script on https://astashaddict.co.uk/shop/fifty-shades-dyed-to-order/

As you can see, if you choose a variation, nothing happens (the add to cart doesn’t show). If I force show the add to cart and try to add a product, I get an error saying no variation was chosen, so it’s obviously not registering the dropdown selection.

I tried disabling all plugins and commenting out all JS and still nothing. Any ideas?

https://www.ads-software.com/extend/plugins/woocommerce/