PlayerPrefs Bug

I can't set the "UnityGraphicsQuality" using PlayerPrefs.SetInt("UnityGraphicsQuality", QLevel) and QLevel is the right value. UnityGraphicsQuality will be set until I exit the game and start it again, so the value saves so I can see it in regedit, but when I start the game again the value gets set to 3 which is the value I started being before setting it.

I'm using this code to apply it:

             if (GUI.Button(Rect(Screen.width/2 - 100, Screen.height/2 + 52, 200, 25), "Apply")) {
                 PlayerPrefs.SetInt("UnityGraphicsQuality", QLevel);
                 QualitySettings.SetQualityLevel(PlayerPrefs.GetInt("UnityGraphicsQuality"));
                 PlayerPrefs.Save();
                 log("Settings applied!");
             }

And this code to toggle it:

             if (GUI.Button(Rect(Screen.width/2 - 100, Screen.height/2, 200, 25),"Quality: " + QualitySettings.names[QLevel])) {
                 if (QLevel != 5) {
                     QLevel += 1;
                 } else {
                     QLevel = 0;
                 }
             }

And last this code to load it:

 var QLevel : int;
 
 function Start() {
     if (PlayerPrefs.HasKey("UnityGraphicsQuality")) {
         QLevel = PlayerPrefs.GetInt("UnityGraphicsQuality");
     }
 }