Different Heel size on Android Unity 5 devices

I created a game type Infinite Runner that works correctly in the Game tab of Unity 5 but in android when I perform Jump in my character it has a rise always of different size, how can I solve this problem?

  

OBS: The app was tested on 2 different Androids (4.4.2 and 5.0) (have had the error in question).

Functions that perform Jump

void FixedUpdate () {
    CheckPlayerInGround();
    MakeJump();
    animator.SetBool("jump", !steppingDown);
}

void CheckPlayerInGround(){
    steppingDown = Physics2D.OverlapCircle(GroundCheck.position, 0.2f, whatIsGround);
}

void MakeJump(){
    if(Input.touchCount > 0){

        if((Input.GetTouch(0).position.x < Screen.width / 2) && steppingDown){
            if(slide == true){
                UpdateColliderScenarioPosition(0.37f);
                slide = false;
            }
            audio.PlayOneShot(audioJump);
            audio.volume = 0.75f;
            playerRigidbody2D.AddForce(new Vector2(0, jumpPower * Time.fixedDeltaTime));
        }
    }
}