Coin value is doubling on some scenes and not others?

I have made a prefab with a coin value of 5. It is picked up as the player collides with the coin and a score displayed on the canvas.

However, on some scenes the coin value is doubled for some reason (instead of recording a score of , a score of 10 is recorded instead) which is not intended.

I have tried deleting the coins/ prefab but when ever a new coin is added to the same scene it always doubles the value???

CoinValue Script:

  public class CoinValue : MonoBehaviour {   
  
  public int value;  
  
  }

Score Script:

  public class ScoreManager : MonoBehaviour {

 public static int Money;


 Text ScoreCounter;

 void Awake()
 {
     ScoreCounter = GetComponent<Text>();

     Money = 0;
 }

 void Update()
 {
     ScoreCounter.text = "Score: " + Money;
 }

 }

Collision Script:

 public class CoinPickup : MonoBehaviour {

 void OnTriggerEnter(Collider col)
 {
     if (gameObject.CompareTag("Coins"))
     {
         Destroy(gameObject);

         ScoreManager.Money += gameObject.GetComponent<CoinValue>().value;
     }

 }
 }

All of these scripts are then added to the prefab coin under the tag Coins.

Any help on this would be great because I've tried a couple of different ways of counting the coins collected but the problem seems to persist.

Thanks for reading.