character moving after moving

My character moves after spawning and stop on one place. I cant find the problem. I have a code like this :

function OnLevelWasLoaded(thisLevel: int)

{
transform.position = GameObject.FindWithTag("spawn").transform.position;

 standing = true;

}

I dont know what is the caused of the unnecessary movement of my character.

I control my character using mouse click and here is the code which I Got from the internet:

var smooth:float; // Determines how quickly object moves towards position

var isWalking : boolean;

var lastP;

var move;

var pressed: boolean;

var standing : boolean;

var objectP ;

private var targetPosition:Vector3;

function Start()

{

animation.Stop();

//animation.Play("idle"); // this stops Unity from playing the character's default animation.

standing = spawnPointScript.standing;

}

function Update () {

pressed = false;

if(standing==false){

 if(pressed== false)

 {

 if(Input.GetKeyDown(KeyCode.Mouse1))

 {

     smooth=5;

     var playerPlane = new Plane(Vector3.up, transform.position);

     var ray = Camera.main.ScreenPointToRay (Input.mousePosition);

     var hitdist = 0.0;

  

     

     if (playerPlane.Raycast (ray, hitdist)) {

         var targetPoint = ray.GetPoint(hitdist);

         targetPosition = ray.GetPoint(hitdist);

     

         var targetRotation = Quaternion.LookRotation(targetPoint - transform.position);

         transform.rotation = targetRotation;

        

         }

         

}

 move =transform.position = Vector3.MoveTowards(transform.position, targetPosition, Time.deltaTime*smooth);

 if(lastP != move)

             {

                 if(!isWalking){

                    isWalking= true;

                    animation.Play("walk");

                    

                 }

             }

  else 

       {

            if(isWalking)

             {

                 isWalking = false;

                 animation.Play("idle");

             }    

         }     

 lastP =move;}

 pressed = true;

 }

 

 else if(standing == true)

 {    

     animation.Stop();

     if(Input.GetKeyDown(KeyCode.Mouse1))

     standing = false;

 }

}

I already spent 2 hours looking for the solution but still, I cant find one.. hope you can help.. thanks