Hello,
Please check how it works with the default WordPress theme and Woocommerce Storefront theme just to check whether the issue is with our theme or not. Also, please check the site with our theme but only with the theme default plugins activate, and deactivate all the 3rd party plugins from the site.
If it works fine with the default WordPress theme then provide the admin panel login details of the website to check it myself and help you out accordingly.
Best Regards