OnTriggerEnter() is occasionally not occurred

I am making some kind of casual sport game with some rhythm-tap contents.

I tried to make a system of touching to decide what score you get for that trial.

A target pad comes down from top, and there is a "node". If you touch right in time(when the node is in the target area), it will gives you certain amount of score.

the dark green-white area is target, and the white line under red person is node.

I have named dark-green area "pass", light green area "good", and white area "perfect".

And I have created a code

 using UnityEngine;
 using System.Collections;
 
 public class NodeCtrl : MonoBehaviour {
 
     public GameMgr gameMgr;
     public int score = 0;
 
     void Awake(){
         gameMgr = GameObject.Find ("GameMgr").GetComponent <GameMgr>();
     }
 
     void OnTriggerEnter(Collider coll){
         if (coll.CompareTag ("PERFECT")) {
             Debug.Log("perfect");
             score += 1;
         }
         if (coll.CompareTag ("GOOD")) {
             Debug.Log("good");
             score += 1;
         }
         if (coll.CompareTag ("PASS")) {
             Debug.Log("pass");
             score += 1;
         }
         coll.enabled = false;
     }
 
     public void SendBackScore (){
         Debug.Log (score);
         //GameObject.Find ("GameMgr").GetComponent<GameMgr>().Call(score);
         gameMgr.Call (score);
         score = 0;
     }
 }

However the console log occasionally says that I have got "miss"(which is 0 of score) when appropriately matching the node into target area. It happens about once in 5~15 trials randomly. By checking with Debug.Log(), it seems like to be that the OnTriggerEnter() part of my code does not work properly.

What can I do for solving this?