Skipping Movement when in fixed time?

I am trying to make a game where you can run very fast and go into slow motion when you left click. But in slow motion, but the movement is very shaking and skipping. I found out that if I hold both the W and D keys down at the same time I get a smooth movement. It gets even more shaky when I increase my walkSpeed. Here is my code:

 public float walkSpeed;
 
 void Update(){
     MovePlayer()
 }
 
 void MovePlayer(){
 float horiz = Input.GetAxis("Horizontal");
 float vert = Input.GetAxis("Vertical");
 
 Vector3 moveDirSide = transform.right * horiz * walkSpeed;
         Vector3 moveDirForward = transform.forward * vert * walkSpeed;
         
 
         charControl.SimpleMove(moveDirSide);
         charControl.SimpleMove(moveDirForward);
         
         if (Input.GetButtonDown("Fire1"))
         {
             Debug.Log(Time.fixedDeltaTime);
             FlashTime();
         }
         
         if (Input.GetButtonDown("Fire2"))
         {
             FlashTime2();
         }
 }
 void FlashTime ()
     {
         Time.timeScale = 0.02f;
         Time.fixedDeltaTime = Time.timeScale * 0.02f;
     }
     
     void FlashTime2 ()
     {
         Time.timeScale = 1;
         Time.fixedDeltaTime = Time.timeScale * 0.02f;
     }

Does anyone know whats wrong?

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