DeviceOrientation not working fine

Hello,

I'm currently developing an application for my android tablet. I just added a simple GUI label:

 GUI.Label(new Rect(10,110,200,100),"Device Orientation " + Input.deviceOrientation.ToString());

It just displays the current orientation on the device. However it has a weird behaviour because it doesn't display the right orientation.

When i hold it Portrait it says LandScapeLeft When i hold it PortraitUpsideDown it says LandScapeRight When i hold it LandScapeLeft it says PortraitUpsideDown When i hold it LandScapeRight it says Portrait

get it?

the Faceup and FaceDown work right.

What am i doing wrong? Is it a problem in the hardware?

Thanks for your help.