TouchPanel and DisplayOrientation

I’m using the TouchPanel of the Windows Phone emulator, and when I rotate the screen from portrait to landscape, the position given by the TouchPanel seem to be limited by the width of the portrait. Mmmh I don’t know if it’s clear…
For example, with the WP10 6 inch emulator, the resolution is 1080x1920, I rotate the screen (1920x1080) and now if I touch the screen, the X position of the TouchPanel is always lower or equals to 1080 !!
If I use the mouse and EnableMouseTouchPoint=true, the TouchPanel positions are corrects.
And what is the difference between TouchCollection GetState() and TouchCollection GetState(window).GetState() ?