When i updatedt othe new version of woocommerce, the default product galery doesn’t seem to work.
When you try to click on a product image on a product page, it open directly the jpg, and you can’t go to another image, you have to go back then choose another image.
I tried the unite demo on your site and it behave exactly the same.
That’s more than likely an issue with WooCommerce. The best advice I can give at the moment is to find a third party plugin that can provide the lightbox feature to your product pages, or open bug report with WooCommerce so that they can look into getting a solution in place.