Hey @homemadejam,
Can you confirm that your WordPress and PHP versions are up to date?
WordPress version is current.
PHP version: 7.3.24
I know that is not the most current version of PHP, but it has not changed recently and this issue with the theme styles not loading is quite recent.
Hey @homemadejam,
You might want to try clearing your cache and reinstalling the WordPress.
Deleting all plugins via FTP finally did the trick. I am now slowly re-installing them one by one.
Note: I had already deleted plugins via the Dashboard, but when I accessed FTP I could still see the folders.