Thank you for reply!
I’m using customized Woocommerce and WP theme. It’s Sales zone https://premmerce.com/premmerce-woocommerce-themes/. As far as I understand there is some
incompatibility between the plugin and the theme. I’ve checked and found it out that plugin works perfectly on the basic Woocommerce platform.
The link is http://zsgbkby.vh113.hosterby.com/bloki-fbs/
Is it possible to solve this issue?