Why Wiimote (or Glovepie, or Unity3D...) pull in the above-left corner ?

I made this simple script for “Glovepie” :

 **************************Joystick Virtuale - Modificato da Dario Cavallo.
 wiimote1.Led1 = true
 // Variabili (wiimote.gy non è utilizzato)
 var.xRot = Wiimote.gx
 var.yRot = Wiimote.gy
 var.zRot = Wiimote.gz
 
 debug = 'X:' + var.xRot + ', ' + 'Y:' + var.yRot + ', ' + 'Z:' + var.zRot
 
 **************************Assi Analogici Wiimote
 
        // Destra / Sinistra
        ppjoy.Analog0 = -maprange (smooth(Wiimote.gx, 5) , -1 degrees, 1 degrees, -1 , 1)
 
        // Su / Giù
        ppjoy.Analog1 = -maprange (smooth(Wiimote.gy, 5) , -1 degrees, 1 degrees, -1 , 1)
 
        // Asse-gY (Da Non utilizzare:
        // ppjoy.Analog XX = -maprange (Wiimote.gy, -90 degrees, 90 degrees, -25 , 25)
 
 **************************Assi Analogici Nunchuk
        // Su / Giù
           //ppjoy.Analog2 = -wiimote.Nunchuk.gz
        // Sinistra / Destra
           //ppjoy.Analog3 = -wiimote.Nunchuk.gx
        // POV
           //ppjoy.Analog8 = -maprange (wiimote.Nunchuk.JoyX, -90 degrees, 90 degrees, -180 , 180)
 
 **************************Assegnazione Tasti
 ppjoy1.Digital0 = wiimote1.A
 ppjoy1.Digital1 = wiimote1.B
 ppjoy1.Digital2 = wiimote1.Minus
 ppjoy1.Digital3 = wiimote1.Home
 ppjoy1.Digital4 = wiimote1.Plus
 ppjoy1.Digital5 = wiimote1.One
 ppjoy1.Digital6 = wiimote1.Two
 // Tasti Direzionali
 ppjoy1.Digital7 = wiimote1.Up
 ppjoy1.Digital8 = wiimote1.Down
 ppjoy1.Digital9 = wiimote1.Left
 ppjoy1.Digital10 = wiimote1.Right
 // Tasti Nunchuk
    //ppjoy1.Digital10 = wiimote.Nunchuk.Zbutton
    //ppjoy1.Digital11 = wiimote.Nunchuk.Cbutton
 // Wiimote speaker
    // wiimote1.Frequency = 1500
    // wiimote.volume = 5%

This works very well, with little rotational movement og Wiimote gyro, it is possible to achieve a good sensivity!

But the problem is:

1) Why Wiimote (or Glovepie, or Unity3D, I am not sure…) pull in the above-left corner of the screen?

2) In Unity3D the 3D object slide over a table fortunately, and all works correctly…

3) But why happens, this behaviour?

(...In Unity3D I added the "Slerp" function, to remove the Wiimote gyro flickering, and made some correction to the "Rotate Behaviour Script"...):

 var maxVert: float = 90; // define the max vertical angle (to each side)
 var maxHor: float = 90;  // define the max horizontal angle (to each side)
 private var initRot: Quaternion;
 
 function Start(){
   initRot = transform.rotation;
 }
 
 function Update(){
   var angV = Input.GetAxis("Vertical") * maxVert;
   var angH = Input.GetAxis("Horizontal") * maxHor;
   var target  = initRot * Quaternion.Euler(-angV, 0, angH);
   // Dampen towards the target rotation
   transform.rotation = Quaternion.Slerp(transform.rotation, target,
                          Time.deltaTime * 1);;
 }

Please, hurry, response me!

It’s urgent!

Thanks you!

Horsepower.