ScreenToWorldPoint Weird Problem (Android)

Hello, I've made some Android games and haven't seen this problem, but this time its killing me for a whole day and I couldn't figure out whats going on !

This is a small example of my code, which doesn't work neither...

 if (Input.touchCount==1 && Input.GetTouch(0).phase==TouchPhase.Began)
 GameObject.Find("Sphere").GetComponent.<Transform>().position=Camera.main.ScreenToWorldPoint(Vector3(Input.GetTouch(0).position.x,Input.GetTouch(0).position.y,10));

The problem is on Android, in editor or remote everything works fine but as soon as I get the apk file running on my android, the Sphere will have offset from my touched point as far as I get away from (0,0). and when I almost reach half of the screen, it goes out from the other end of the screen... like its multiplying by a number.

Something like this, + is where I touch the screen and O is where the Sphere goes:

 [+O     ] [  +  O ] [    +  ]  O
 [       ] [       ] [       ]
 [       ] [       ] [       ]
 [       ] [       ] [       ]

My camera NearPlane is set to -10 and the game is 2D so the camera is Ortographic as well... even in the next level of this game I don't have any problem ! only this level is drilling my brain :(

Also my phone is fine because I can run other games on it and they work fine.

Thanks for your help :\