Problem with duplicated score!

I'm using a script to add score, the script is simple it uses a OnTriggerEnter2D to detect player collider enter and add += 1 to the score, but some times if a pass faster on 4 coins for example it ads 6, 5, 7, it duplicate, i don't know why! C#

T$$anonymous$$s is the player script, can't show all but t$$anonymous$$s is the score part:

 void OnTriggerEnter2D ( Collider2D other  ){
         if(other.tag == "coin"){
             //If the player touches a coin, it will find the object that manages the coin count and tells it that a coin was taken.
             GameObject score = GameObject.Find("Score");
             score.BroadcastMessage("getCoin", SendMessageOptions.DontRequireReceiver);
             //after t$$anonymous$$s, the object is destroyed so it can't add more points again.
             Destroy(other.gameObject);
         }
     }

T$$anonymous$$s is the Score script that display how much totalCoins i have on gui.

 using UnityEngine;
 using System.Collections;
 
 public class Score : MonoBehaviour {
 
 
 
     
     //T$$anonymous$$s is the sound we want to play if a player gets a coin.
     public AudioClip coinSound;
     
     //t$$anonymous$$s is a private variable that we'll set as a saved variable in Start().
     [HideInInspector]
     public static int totalCoins;
     
     void Start (){
         //T$$anonymous$$s sets the private variable to the saved variable we create thats also in t$$anonymous$$s script. It allows us to carry on information that the player has changed by playing.
         totalCoins = 0;
         //T$$anonymous$$s sets the Text in the top right Corner to display how many coins we have depending on the variable totalCoins. Ex. COINS: 16
         transform.guiText.text = "COINS: " + totalCoins.ToString();
     }
     
     //T$$anonymous$$s function is called when a coin sends us the message "getCoin" w$$anonymous$$ch is in the coin.cs script.
     public void getCoin (){
         //once we receive the message from the coin, we play the sound we set when a coin is taken.
         audio.PlayOneShot(coinSound);
         //we add 1 to totalCoins
         totalCoins += 1;
         //t$$anonymous$$s updates the text in the top left corner again, just like in method Start()
         transform.guiText.text = "COINS: " + totalCoins.ToString();
     }
 }

##BIG WARNING, MY PLAYER HAS 2 COLLIDERS, ONE BOX2D AND ONE CIRCLE2D I THINK IT'S THIS, BUT HOW TO THE SCRIPT DETECT 1 COLLIDER, OR HOW TO MAKE A 2d CHARACTER WITH 1 COLLIDER Oo##