protect a page with password

Hi. I created a page protected by a password, and it works, when i access to it, it asks me the password.
Now i created another page, protected by a password too. In this page, when i access, it doesn’t aks me the password, and it shows me the content.
I noticed that if i access to that page with another browser, which is not logged in as amministrator, it asks me the password, but if i access with the browser logged in as amministrator, it shows me the content without asking password.

This problem is not presented with the first page created.

Have you any idea?

Thank you for your support.