Highscore PlayerPrefs not working on iOS

I am having a problem with the playerprefs i setup for my score/highscore system. Currently, the problem is that (on iOS) when the player dies, the highscore does not show. This problem does not occur in the editor on my computer when i run the game. It's strange.

Here's my code for where the score system occurs in the play screen. I believe the problem has something to do with the PlayerPrefs.Save(), considering I barely know how it works exactly. Keep in mind I am relatively knew to Unity and C#.

 void Update () 
     {
         //Score
         if (moving == true) {
             score += Time.deltaTime;                            //to reset highscore, set score = 0.01f
             scoreText.text = "" + score.ToString ("f2");
         }
 
         //Set Player Score Pref
         PlayerPrefs.SetFloat ("Player Score", score);
         PlayerPrefs.Save ();
         
         //Set High Score Pref
         highscore = PlayerPrefs.GetFloat ("High Score", score);    
         if (score > highscore) {                                //to reset highscore, switch 'highscore' with 'resetHS'
             PlayerPrefs.SetFloat ("High Score", score);
             PlayerPrefs.Save ();
         }
     }

In my Game Over screen I show the score and the highscore. The score works on iOS, but the highscore does not. Here is the code I used for that.

 void Start () 
     {
         PlayerPrefs.Save ();
         finalscore = PlayerPrefs.GetFloat ("Player Score");
         scoreText.text = "" + finalscore.ToString("f2");
         PlayerPrefs.Save ();
         highscore = PlayerPrefs.GetFloat ("High Score");
         highscoreText.text = highscore.ToString("f2");
     }

Thanks in advance for the help!