Did you have a look through the settings menu for a stretch image or similar option?
EDIT or in the viewer software that your using.
It's apparent when using the device that everything is stretched, I just opened firefox with that circle image to make it easier to see. It's even clear that the circle you drag to unlock is elongated too.
The only thing I can see with display options that are relevant are for HDMI and they dont seem to affect the actual devices screen