Time.deltaTime High Score and Score count gives high score, but carries on counting it after saving with playerprefs

Hi, I am making a survival run game for wp8. I have got a timer which works efficently with Time.deltaTime,and a high score that saves after I load my death level. However; I have two questions. The first is when I respawn, the highscore shows my previous time but still counts up on the timer. Secondly, the high score resets after quitting and loading the app. Here are the scripts.

 var IncreaseTime : boolean = true;
 static var Timer = 0.0;
 static private var highScore : float;
 var collectedTime : boolean = true;
  
 static public function AddPoint() {
 if(Timer > highScore) {
 highScore = Timer;
 }
 }
  
 function Update ()
 {
 if(IncreaseTime == true)
 {
 Timer += Time.deltaTime;
  
 guiText.text = "" + Timer;
 }
 if(Timer > highScore) {
 highScore = Timer;
 }
 if(IncreaseTime == false){
 Timer += Time.deltaTime;
 
 guiText.text = "" + Timer;
 }
 if(collectedTime == true){
 
 }
 } 
 
 
 function Start() {
 highScore = PlayerPrefs.GetFloat("highScore", 0);
 collectedTime = true;
 
 }
 
 function OnDestroy() {
 PlayerPrefs.SetFloat("highScore", highScore);
 {
 IncreaseTime = false;
 Debug.LogError("lol unity is giving you errors for no reezon!");
 }
 }


 #pragma strict
 
 var TimeKeeper : float;
 function Start () {
 
 }
 
 function Update () {
 TimeKeeper += Time.deltaTime;
  
 guiText.text = "" + TimeKeeper;
 }