I'm working on - https://nhukr.org/
When I open the site first I don't see my last changes, sometimes, the site looks like it without CSS.
I cleaned the cache with different plugins. I disable caching on the server, and my hoster said to me that they don't use CDN for my webpage, I changed the theme from Astra to Twenty Twenty-One it also doesn't help.
The problem you can see if you open the webpage on your phone and refresh
Plugins I have: