Hello, @gwiezdnewrota,
Yes, I have checked your issue and found the cause of it. Actually, in the section, there is a class called “elementor-invisible” that’s why the section disappears for the first for somtimes. See image: https://postimg.cc/7bz8P2Rp Now, there are some possible reasons for this. This could be a cache issue because sometimes it works just fine as you said. So please contact your service provider to flush the server cache and please disable the cache plugins if you are using them on your site. Then check back to your site after clearing the browser cache I hope your issue will be resolved.
Note: If you still facing the issue then please share your site wp-admin URL and access in the private content area and allow us to change/remove the plugins and debug your site. Please take the complete backup of your site as well.
Regards 8Themes Team.