Why is my highScore counting from 10 , not from 0 ??? Thanks in advance :))

using System.Collections; using UnityEngine;

public class idemmosc : MonoBehaviour {

 public float speed = 4f;

 public Rigidbody2D rb;

 private float movement = 3f;

 static int score = 0;
 static int hiScore = 0;

   public GUIText text;

 static public void AddPoint()
 {
     score++;
     if (score > hiScore)
     {
         hiScore = score;
     }
 }
 void Start()
 {
     score = 0;

     hiScore = PlayerPrefs.GetInt("hiScore", 0);

     text.text = "Score" + "\nHiScore" ;

 }
 void Update()
 {
     movement = Input.GetAxis("Horizontal") * speed;
 }
 void FixedUpdate()
 {
     rb.MovePosition(rb.position + new Vector2(movement * Time.fixedDeltaTime, 0f));
 }

 void OnCollisionEnter2D(Collision2D other)
 {
     PlayerPrefs.SetInt("hiScore", hiScore);
     if (other.gameObject.name == "Ball")

         text.text = "Score" + score + "\nHiScore" + hiScore;
     AddPoint();

 }

}