stumped on level unlock

I followed a tutorial on level unlocking; it's supposed to unlock the next level if the player gets at least one star on the game. It works for level 1 but then just unlocks the next level if the level is played from level 2 on. I'm going crosseyed trying to figure this out and figured I'd just ask what my error is. Forgive the comments, I'm using them as I learn.

    //fill information based on level class
     public void FillList()
     {
 
 
         //Destroy(GameObject.FindWithTag("LevelButton"));
         //get all components to add, for each variable in the list called LevelList
         foreach(var level in LevelList)
         {
             //instantiate and populate each button, establish which information goes into it
             GameObject newbutton = Instantiate(levelButton) as GameObject;
             //connect new button prefab to levelbutton c# script and call new button gameobject "button"
             LevelButton button = newbutton.GetComponent<LevelButton>();
             //set button prefab text element to leveltext in inspector
             button.LevelText.text = level.LevelText;
 
             //if level text contains a 1, then make it unlocked and make it interactable
             if(PlayerPrefs.GetInt("Level" +  button.LevelText.text) == 1)
             {
                 level.UnLocked = 1;
                 level.IsInteractable = true;
             }
 
             //if (PlayerPrefs.GetInt("Level" + button.LevelText.text+"_star") >= 1)
             //{
             //    int NextLevel = cl + 1;
             //    PlayerPrefs.SetInt("Level" + NextLevel, 1);
             //    level.UnLocked = 1;
             //    level.IsInteractable = true;
             //}
 
             //update the button, set it as unlocked and interactable from level manager
             button.unlocked = level.UnLocked;
             button.GetComponent<Button>().interactable = level.IsInteractable;
 
             //add a listener for onclick -try to call a function
             button.GetComponent<Button>().onClick.AddListener(() => LoadLevels("Level" + button.LevelText.text));
 
             //activate stars on each button, depending on playerprefs
             if (PlayerPrefs.GetInt("Level" + button.LevelText.text + "_star") >= 1)
                 {
                 button.Star1.SetActive(true);
 
                 int NextLevel = cl + 1;
                 PlayerPrefs.SetInt("Level" + NextLevel, 1);
 
                 level.UnLocked = 1;
                 level.IsInteractable = true;
                 }
             if (PlayerPrefs.GetInt("Level" + button.LevelText.text + "_star") >= 2)
                 {
                     button.Star2.SetActive(true);
                 }
             if (PlayerPrefs.GetInt("Level" +button.LevelText.text + "_star") == 3)
                 {
                     button.Star3.SetActive(true);
                 }
 
 
             //at last step, put new buttons under spacer parent, including transform info
             newbutton.transform.SetParent(Spacer);
         }
         Saveall();
     }
 
 
     //let the button know if it's unlocked, save player prefs 
     //go through every button, check if it's locked or unlocked
     void Saveall()
     {
 
         //if (PlayerPrefs.HasKey("Level1"))
         //{
         //    return;
         //}
         //else
         //{
 
             //tag button prefab with tag and find the objects with that tag, make a gameobject array of them
            GameObject[] allButtons = GameObject.FindGameObjectsWithTag("LevelButton");
             //check each button 
             foreach (GameObject buttons in allButtons)
             {
                 //get Level Button C# script component from prefab
                 LevelButton button = buttons.GetComponent<LevelButton>();
                 //find the right level based on level text, set as unlocked in player prefs
                 PlayerPrefs.SetInt("Level" + button.LevelText.text, button.unlocked);
 
             }
         //}
     }