Hi str.ivanov,
Thanks for reaching to us.
1. Could you please check how it works with some default WordPress themes like TwentyTwenty or WooCommerce Storefront to understand is it our theme issue or not?
2. You also should deactivate all plugins (except Required Plugins) and then reactivate them one by one. This makes it very easy to isolate the plugin causing problems.
Please let me know how it goes.
Best Regards,
Hung PD