Paddle glitching problem

Paddle.cs

using UnityEngine;
using System.Collections;

public class Paddle : MonoBehaviour
{

    // Use this for initialization
    void Start()
    {

    }

    // Update is called once per frame
    void Update()
    {
        Vector3 paddlePos = new Vector3(0.5f, transform.position.y, 0f);

        float mousePosInBlocks = Input.mousePosition.x / Screen.width * 16;

        paddlePos.x = Mathf.Clamp(mousePosInBlocks, 0.5f, 15.5f );

        this.transform.position = paddlePos;

        print(Input.mousePosition.x);

    }
}