Sorry to make you grumble with the save comment, but it's commonly missed since the page is so long depending on the screen layout and resolution (figured I'd just mention it just in case).
Radius users should be abiding by the Global (AMP Setup) portion - unless they have the override set on Home -> User Info. The issue is that if you have several users and they are all toggling different options in AMP Setup, then you'll want them to use the Home -> User Info setting. Check to make sure that your user does not have 'Customize Header Columns' checked on Home -> User Info if you're trying to adjust the Global (AMP Setup) portion.
Also, the header bar is loaded separately, so sometimes ctrl+r (F5 refresh) can help. If you're updating the Top Header stats and not seeing the change on the Top Header, then you might also want to check and make sure there are no crash messages in /var/log/httpd/error_log & access_log.