Lock/Unlock system don't work perfectly

Hi all, for my lock/unlock system I have used this tutorial because I'm a beginner in unity, http://www.thegamecontriver.com/2014/09/create-level-lock-unlock-system-unity-46.html

I did everything the same, but only the last script (Player Movement), in my game you got for example 2 holes and 2 bales, in every hole must go a ball to load to next level and unlock the level. This is the script:

public bool[] holeTrigger = new bool[6];

 protected string currentLevel;
 protected int worldIndex;
 protected int levelIndex;
 // Use this for initialization
 void Start () {
     //save the current level name
     currentLevel = Application.loadedLevelName;
 }
 
 // Update is called once per frame
 void Update () {
     //move the player based on left and right arrow keys
     transform.Translate(Input.GetAxis("Horizontal")*Time.deltaTime*10f, 0, 0); //get input
 }

 

 public void TriggerHole(int index) {
     holeTrigger[index] = true; //Set the hole trigger to true
     
     //Check if all holes have been triggered
     if (AllTriggered)     
         UnlockLevels();   //unlock next level funxtion 
         Application.LoadLevel("fLevel1");
 }
 
 //This method will iterate through each of the triggers in the array and return false if any of them are not true.
 public bool AllTriggered {
     get{
         bool b = true;
         foreach(bool bX in holeTrigger){
             if(!bX)
                 b = false;
         }
         return b;
         ;}
 }

 protected void  UnlockLevels (){
     //set the playerprefs value of next level to 1 to unlock
     for(int i = 0; i < LockLevel.worlds; i++){
         for(int j = 1; j < LockLevel.levels; j++){               
             if(currentLevel == "Level"+(i+1).ToString() +"." +j.ToString()){
                 worldIndex  = (i+1);
                 levelIndex  = (j+1);
                 PlayerPrefs.SetInt("level"+worldIndex.ToString() +":" +levelIndex.ToString(),1);
             }
         }
     }

 }

So when the balls are in the two holes it will load "fLevel1" and unlock the next level, but the problem is that it loads and unlock the next level when there is one ball in one hole, but the purpose is that there are two balls and two holes and unlock and load the next level when they are in the holes. If I delete the UnlockLevel(); it works. Does somebody know what the problem is?

Thanks!