How to stop enemy AI from vibrating when tracking y component

When my AI tracks my balls y component and moves to the same y component, it starts to vibrate as it gets closer, even if the y component is exactly the same, flicking between going up 7 and down -7. The code for it looks like this

     #endregion
     #region Inspector Variables
     [SerializeField] private float moveSpeed;
     [SerializeField] private Vector2 ballPos;
     [SerializeField] private GameObject ballRef;
     #endregion
     #region Private Variable
     private float yInput;
     #endregion
     #region Components
     Rigidbody2D rb;
     #endregion
     private void Start()
     {
         rb = GetComponent<Rigidbody2D>();
     } //Onstartup executes
 
     private void FixedUpdate()
     {
         UpdateBallPos();
         MoveAI();
     }
 
 
     #region Methods
     private void MoveAI()
     {
         if (ballPos.y > transform.position.y)
         {
             rb.velocity = new Vector2(0, 1 * moveSpeed);
         }
         else if (ballPos.y == transform.position.y)
         {
             rb.velocity = new Vector2(0, 0);
             Debug.Log("resting pos");
         }
         else
         {
             rb.velocity = new Vector2(0, -1 * moveSpeed);
         }
     }
 
     private void UpdateBallPos()
     {
         ballPos = new Vector2(ballRef.transform.position.x, ballRef.transform.position.y);
     }
     #endregion

ballRef is linked to the ball that my game tracks during FixedUpdate

When the y coordinates for both start to become similar then my AI starts to bug out and start vibrating. It still tracks accurately but I'm not sure if there is a way to resolve my vibrating.