When changing from full screen to normal, why does it take me back to the home page?

[WPCentral Question]

when changing from full screen to normal it takes me back to home page.

when changing from full screen to normal and vice versa every time i press the esc key or the expand key it takes me to the home page. doesn't sound like much of a problem but i a, constantly going in between full and normal screen its really annoying!!! is there a way that i can change the setting so it keeps me on my current application.