Add to cart button missing? Lightbox stopped working too

Hi Guys

On my site I have a product with variations, it was working fine but since updating my Pinboard theme the ‘Add to cart’ button is missing. Strange thing it that it appears on other products.

Any ideas what might be causing this?

Not sure if its connected but the Lightbox image option has stopped working too.

Problem product: https://www.northernwild.co.uk/index.php/product/test-print/

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