There are two files that are not updating, specifically:
smbhd.rf.gd/themes/modern/style.css
smbhd.rf.gd/img/favicon.ico
What is going on? How do I fix this?
The files you listed are identical on your website and on the file system as far as I can see. This issue sounds like browser cache. Could you try to open the files directly in a private browsing window and check if you still see the outdated content?