Character sliding across terrain

I wrote a simple character movement script but for some reason when the character starts moving they slide slowly across the map. I’m not new to programming but I am new to C# so I’m unsure if there is something I am missing in my code. Any help would be greatly appreciated!

[SerializeField] private string horizontalInputName;
[SerializeField] private string verticalInputName;
[SerializeField] private float movementSpeed;

private bool isMoving = false;

private CharacterController chardController;

private void PlayerMovement(){

if (((Input.GetAxisRaw(horizontalInputName)) != 0) || ((Input.GetAxisRaw(verticalInputName)) != 0)) 
{
	isMoving = true;
	Debug.Log ("is moving");
}
else
{		
	isMoving = false;
	Debug.Log ("is not moving");
}

if (isMoving) 
{
	float horizInput = Input.GetAxisRaw (horizontalInputName) * movementSpeed;
	float vertInput = Input.GetAxisRaw (verticalInputName) * movementSpeed;

	Vector3 forwardMovement = transform.forward * vertInput;
	Vector3 rightMovement = transform.right * horizInput;

	chardController.SimpleMove (forwardMovement + rightMovement);
} 
else 
{
	chardController.gameObject.transform.position = Vector3.zero;
}

JumpInput ();
SprintInput ();

}

I figured out the solution for anyone who runs into this problem and has a character controller set up this way. For some reason when I use an Xbox controller instead of the keyboard it never sets the axis values to 0 so the statement:

if (((Input.GetAxisRaw(horizontalInputName)) != 0) |((Input.GetAxisRaw(verticalInputName)) != 0))

really should be:

if ((((Input.GetAxisRaw(horizontalInputName)) > 0.1) || ((Input.GetAxisRaw(horizontalInputName)) < -0.1)) || (((Input.GetAxisRaw(verticalInputName)) > 0.1) || ((Input.GetAxisRaw(verticalInputName)) < -0.1)))

Also, I did:

chardController.gameObject.transform.position = Vector3.zero; as a definitive way to test if my boolean worked but the correct line of code would be:

chardController.SimpleMove (new Vector3 (0, 0, 0)); so it doesn’t set it back to the origin of the map.

Hope this helps!