Password Protection problem

I password protected a page, and that works well for the first time. I was asked for the password, entered it and then it took me to the page. NOW – when I close the website and come back in, I’m no longer asked for a password, even though at the top of the page is says “Protected”. Thinking it was because I was the administrator, I asked someone else to try it on their PC, and they have they same experience. How do I get the page to ask for password EVERY TIME it is viewed and not only the first time?

I have seen this topic but did not see a resolution anywhere and the topic was closed.

The website is: http://www.graniteproperties.com

Thank you!