You are absolutely right - the correct way to say is "authentication method" (when referring to "single password", "ru security" etc.) , while authorization actually refers to what a specific user is allowed to do (permissions volume). This was the initial intent for the current tab name though, to show that different rights and permissions are set for different, well, authentication methods.
We will do our best to correct this mistake and update the program and the documentation as soon as possible. Sorry for any inconvenience.
The infrastructure was expanded just recently. It may take some time for the load to spread evenly across the servers. I recommend that you try in a few hours to see if there are still any issues and let us know.