transform.position returning wrong value (UNITY 2D)

Question

I am trying to place the ball on the paddle until a key is pressed, also there is box collider that triggers if the ball falls down. For some reason the transform.position.y of the ball gameObject is going below zero while the ball is still stuck to the paddle in the game and therefore triggering the collider unnecessarily . Attaching code of paddle and ball bellow .

using System.Collections;
using System.Collections.Generic;
using UnityEngine;

public class ballScript : MonoBehaviour
{
    [SerializeField] GameObject myPaddle;
    Vector3 paddleToBallVector;
    void Start()
    {
        paddleToBallVector = transform.position - myPaddle.transform.position;
        lockToPaddle();
    }
    void Update()
    {
        lockToPaddle();
    }

    private void lockToPaddle()
    {
        transform.position = myPaddle.transform.position + paddleToBallVector;
    }
}

using System.Collections;
using System.Collections.Generic;
using UnityEngine;

public class paddleScript : MonoBehaviour
{
    [SerializeField] float screenWidthUnits = 16f;
    [SerializeField] float paddleLeftLimit = 1.07f;
    [SerializeField] float paddleRightLimit = 14.928f;

    void Update()
    {
        float screenWidthPercentage = Input.mousePosition.x / Screen.width;
        Vector2 curPaddlePos = new Vector2(screenWidthPercentage * screenWidthUnits, transform.position.y);
        curPaddlePos.x = Mathf.Clamp(curPaddlePos.x, paddleLeftLimit, paddleRightLimit);
        transform.position = curPaddlePos;
    }
}

using System.Collections;
using System.Collections.Generic;
using UnityEngine;

public class bottomCollisionScript : MonoBehaviour
{
    private void OnTriggerEnter2D(Collider2D collision)
    {
        Debug.Log(collision.gameObject);
        Debug.Log("Game Over");
    }
}

Answer 1

I found what i did wrong , It was because I used transform to position a Object that had a rigid body. The RigidBody component causes the object to be subject to Physics Laws and trying to reposition it using transform didn't stop factor like gravity acting on it.

Answer 2

In the ball script you need to call

paddleToBallVector = transform.position - myPaddle.transform.position;

in the Update method and not in Start, before you call lockToPaddle. That is because the paddle might be moving in the mean time.

Should note that this is not the proper solution as this can cause the ball to get inside the collider of the paddle. Instead you should you should use a RigidBody2D and apply a force.