When you mention "strange way", is it like where the sensor is completely turned 90 degrees? I don't have my tablet right now I sent it to be repaired for other issues, and I wanted to send a follow up for whether that applied to all of that model. It can best be seen in "Labyrinth", and there is a free version of this game on the Google Play Market. You can see if up really does make it go up, if left really makes the marble go left, and vice versa.