I have a really strange problem on my Drupal site: The site reports double access to every page.
When I'm visiting an admin/something URL as administrator user, I can see in the log a warning alerting me that an anonymous user is trying to access that page.
I discovered this error when clearing the log page and a warning instantly was added telling me that a user is trying to access the page.
How can I check why this double access occurs? This is causing me a lot of problems. (No Drupal message is shown.)