Broken CSS, fonts not loading, pages without style, content visible only in Divi builder

Hi, I am experiencing many problems with my site created with Divi. For several days I have been working on the site in maintenance mode and everything was working fine. This morning I turned off the maintenance mode and put the site live, but I started noticing several problems related to the styles.

The CSS on some pages doesn't load, there are elements that disappear, the fonts are not the right ones, some images are missing, and others show up large.

I contacted the hosting support, they helped me with caching. At first it was working, then again problems.
I disabled static file generation, cleared browser cache countless times, as well as site cache. No change.

Please help me solve this problem!

 

https://puravitamadonie.it/

Currently the site works only because I have activated the Siteground Optimizer plugin, that probably also removes the cache of the plugins and thus the entire site.
I found that Speedy Cache was conflicting with Divi but in any case, even once removed, the CSS was compromised.