Up-ward slope and hop

[idpokute]

I am using tilemap and character controller. (Thanks for advice. I changed rigidbody to character controller.)

When I press arrow key,  my character walks up-ward slope well. (natural walking on downhill is also problem. )
but when I pop the arrow key on the slope, my character suddenly jump once.

when I change runspeed, jumping height is also changed. I don't know why.
can anybody help me?


   CharacterController controller;
   
   float runSpeed      = 20.0f;         // run speed
   float   maxRunSpeed    = 20.0f;   
   float gravity      = 15.0f;
   float   jumpForce   = 10.0f;
   
   Vector3 vVelocity = new Vector3(0, 0, 0);
      
   void Start () {
      controller = GetComponent<CharacterController>();
   }
      
   // Update is called once per frame
   void Update () {
      MoveHorizontal();
   }
   
   //-------------------------------------------------------------------------------------------
   // Movement of Left / Right direction of Character
   //-------------------------------------------------------------------------------------------
   int MoveHorizontal() {
      float ctrlX = Input.GetAxis("Horizontal");                        // Get Input
      float ctrlY = Input.GetAxis("Vertical");      
      bool ctrlJump = Input.GetButtonDown("Jump");
   
      vVelocity.x = ctrlX * runSpeed;   
      vVelocity.y = controller.velocity.y - gravity * Time.deltaTime;
         
      if( ctrlJump == true ) {
         vVelocity.y = jumpForce - gravity * Time.deltaTime;
      }
      
      controller.Move(vVelocity * Time.deltaTime );      
            
      return 0;
   }