Sorry for the extra messages - just doing some more work on a site using this theme. It looks as though it uses some woocommerce functions which have been deprecated with Woocommerce 3.0 .
I'm seeing errors in the logs such as
The The "add_to_cart_fragments" hook uses out of date data structures and function is deprecated since version 3.2.1. Replace with woocommerce_add_to_cart_fragments.
The WC_Cart::get_cart_url function is deprecated since version 2.5. Replace with wc_get_cart_url.
woocommerce_get_product_schema is deprecated since version 3.0 with no alternative available.
Happy to help diagnose / troubleshoot if needed.