My Front Page Module: Bug?

I have a news oriented site, (I am using Joomla 1.5.8 and the latest php and apache). I have a main menu with a menu item named \sections\ set to a section blog layout, which has child menu items to it (for example: Health, Entertainment, etc.) set to category blog layouts. I have the My Front Page Module set up in the menu assignment area to show only when the \sections\ item from the main menu is selected. It shows up fine, but when I click on an article headline displayed in the module, the article shows up UNDERNEATH the material from the My Front Page Module even though the breadcrumbs has moved from \home>sections\ to \home>sections>health>health article.\ I want the article to show by itself when it is selected, and the front page module NOT to show once an article is selected. Is this a bug? How can this be fixed?