Hello,
Sorry but your issue with cart is not related to our theme because it does not work even if all the third-party plugins are disabled and default Storefront theme is enabled https://gyazo.com/9831b3bccd7d8849ca881390c065ff74
Contact WooCommerce support to solve this issue, we are able to help only in case problem caused by theme files.
Also, you used out of date versions of the WPBakery and Revolution slider plugin. We have updated plugins and you need to re-create slider because the latest version removed previously created slider.
Regards