ScoreManager adding more points than wanted?

Hello. I am using a ScoreManager script that is supposed to add only 1 point every time, the object the script is linked to, is touched. It adds 8 points instead of 1. Why is this happening?

The two scripts are

  using UnityEngine;
  using UnityEngine.UI;
  using System.Collections;
  
  public class ScoreManager : MonoBehaviour
  {
      public static int score;        // The player's score.
      
      
      Text text;                      // Reference to the Text component.
      
      
      void Awake ()
      {
          // Set up the reference.
          text = GetComponent <Text> ();
          
          // Reset the score.
          score = 0;
      }
      
      
      void Update ()
      {
          // Set the displayed text to be the word "Score" followed by the score value.
          text.text = "Score: " + score;
      }
  }
  
  

  using UnityEngine;
  using System.Collections;
  
  public class Expands : MonoBehaviour {
      
      public Transform parent;
      public float expandAmount = 2f;
      public float localPosition = 1f;
      public int scoreValue = 1;
  
      void OnMouseDown()
      {
          parent.localScale *=expandAmount;
          for(int i =0;i<parent.childCount;i++)
          {
              parent.GetChild(i).localScale = parent.GetChild(i).localScale/expandAmount;
              parent.GetChild(i).localPosition += new Vector3(0, 0, -1f);//Added a '+'
              ScoreManager.score += scoreValue;
          }
      }
  }
  
  

The second script is where the points are being directed from. All help is appreciated.