Why my counting method is stucked on the beginning?

Hello, I hava created script to count goals, but the text is stucked on 0 even if i it should be 1 or more. Thanks for help :)

 private int score1;
     public Text score1Text;
   
 
     // Use this for initialization
     void Start()
     {
 
         score1 = 0;
         SetScore1Text();
 
    }
 
  void OnCollisionEnter2D(Collision2D collisiongoal)
     {
 
 
         Goal1();
         
    SetScore1Text();
       score1 = score1 + 1;
         
     }
 
     void Goal1 ()
     {
         Goal.gameObject.SetActive(true);
         GoalSound.Play();
         ball.SetActive(false);
         ball.transform.position = destination.position;
         //Debug.Log("Goal!");
         startgoal = true;
         player1.gameObject.SetActive(false);
         player2.gameObject.SetActive(false);
         respawn = true;
 
 
 
     }
 
     void SetScore1Text()
     {
       
         score1Text.text =  score1.ToString();
         
            
     }
      
 
 }