Broken stylesheet due to Server Cache (LiteSpeed Cache, Nginx-Cache, etc.)
If you have LiteSpeed Cache or Nginx-Cache installed on the server and see broken stylesheet like the screenshot below, it is likely due to the cache. To verify if it is related to the server cache: switch to another theme and then view the site with incognito (private) mode. If it doesn't show the theme that you've switched, the issue is related to the cache. Try to clear/disable the cache on the server.