Why does WASD move my player quicker than with a joystick?

For some reason, if you use a keyboard to move my player it’s faster than a joystick. Can anyone help me? Here’s my code:

#pragma strict

var moveSpeed : float;
var clampRadius : float;
var dashSpeed : float;
var walkSpeed : float;
var horizontalDirection : int;
var verticalDirection : int;
var rb2D : Rigidbody2D;
var movement : Vector2;

function Update () {
	movement.x = Input.GetAxis("Horizontal");
	movement.y = Input.GetAxis("Vertical");

function FixedUpdate () {
	rb2D.MovePosition(rb2D.position + movement * moveSpeed * Time.fixedDeltaTime);
	movement = Vector3.ClampMagnitude(movement, clampRadius);
	if(Input.GetKeyDown(KeyCode.Space) == true) {
		rb2D.MovePosition(rb2D.position + movement * dashSpeed * Time.fixedDeltaTime);
	if(Input.GetKey(KeyCode.LeftShift) == true && !Input.GetKeyDown(KeyCode.Space) == true) {
		rb2D.MovePosition(rb2D.position + movement * walkSpeed * Time.fixedDeltaTime);

In fact, the sensivity of the WASD and the joycon are different.

You can tweak them in : Edit → Project Settings → Input Manager.

Inside the Axes drop down, you would find two Horizontal and two Vertical input configurations, one for the WASD and another for the joystick respectively (Type field).

Play with the Dead and Sensivity to adjust them.