Right, so you’re back to more or less where you were before. Can you take a look at the web server logs to see if you’re getting 302 redirects for the CSS still?
If you are, can you use your web browser’s inspection/developer tools to look at the network requests being sent so that you can see what URL the 302 response from the web server is suggesting? The browser developer tools may give some idea as well if it’s a misdirected URL or something else (such as a loop).