3rd person Controller weird behavior.

Hello everyone. I have a scrip based on 3dbuzz.com tutorial and i have problem with strafing my character. So, there is two scripts. First is TP_Controller.

  using UnityEngine;
 using System.Collections;
 
 public class TP_Controller : MonoBehaviour 
 {
  
  public static CharacterController CharacterController;
  public static TP_Controller Instance;
  
  
  // Use this for initialization
  
  void Awake () 
  {
  CharacterController = GetComponent("CharacterController") as CharacterController;
  Instance = this;
  
  }
  
  // Update is called once per frame
  
  void Update () 
  {
  if (Camera.mainCamera == null)
  return;
  GetLocomotionInput ();
  
  TP_Motor.Instance.UpdateMotor();
  }
  
  void GetLocomotionInput()
     {
         // Establish dead zone
         var deadZone = 0.1f;
 
        
         // Calculate new vector each frame
         TP_Motor.Instance.MoveVector = Vector3.zero;
 
         // if outside the deadzone, ie. can handle this input
         if (Input.GetAxis("Vertical") > deadZone || Input.GetAxis("Vertical") < -deadZone)
             TP_Motor.Instance.MoveVector += new Vector3(0, 0, Input.GetAxis("Vertical"));
 
         if (Input.GetAxis("Horizontal") > deadZone || Input.GetAxis("Horizontal") < -deadZone)
             TP_Motor.Instance.MoveVector += new Vector3(Input.GetAxis("Horizontal"), 0, 0);
 
         
     }
  
 }

Second is TP_Motor.

 using UnityEngine;
 using System.Collections;
 
 public class TP_Motor : MonoBehaviour 
 {
  
  public static TP_Motor Instance;
  
  public float MoveSpeed = 10f;
  
  public Vector3 MoveVector { get; set; }
  
  
  // Use this for initialization
  void Awake() 
  {
  Instance = this;
  
  }
  
  // Update is called once per frame
  public void UpdateMotor() 
  {
  SnapAlignCharacterWithCamera ();
  PrecessMotion();
  }
  
  void PrecessMotion()
  {
  //Transform MoveVector to World Space
  MoveVector = transform.TransformDirection(MoveVector);
  
  
  //Normalize MoveVector if Magnitude > 1
  if (MoveVector.magnitude > 1)
  
  MoveVector = Vector3.Normalize(MoveVector);
  
  //Multyply MoveVector by MoveSpeed
  MoveVector *= MoveSpeed;
  
  //Multyply MoveVector by DeltaTime
  MoveVector *= Time.deltaTime;
  
  //Move the Character in World Space
  TP_Controller.CharacterController.Move(MoveVector);
  }
  
  void SnapAlignCharacterWithCamera()
  {
  if (MoveVector.x != 0f || MoveVector.z != 0f)
  {
  transform.rotation = Quaternion.Euler(transform.eulerAngles.x, 
  Camera.mainCamera.transform.eulerAngles.y, 
  transform.eulerAngles.z);
  
  }
  
  }
 }

The problem is that my character (Test Capsule =)) cant strafe forward only backward. That means when i pressing forward key (up/W) and left/right key at the same time my capsule going only forward. But if i pressing backward key + left/right it straif perfectly movig back. So can anyone tell me what is wrong, please?=)