Something weird with my input system

Ok. I followed this tutorial for 3d movement in unity. Here is the code for movement: using UnityEngine;

 [SerializeField] CharacterController controller;
 [SerializeField] float speed = 15f;
 Vector2 horizontalInput;

 [SerializeField] float jumpHeight = 3.5f;
 bool jump;

 [SerializeField] float gravity = -30f;
 Vector3 verticalVelocity = Vector3.zero;
 [SerializeField] LayerMask groundMask;
 bool isGrounded;

 private void Update()
 {
     isGrounded = Physics.CheckSphere(transform.position, 0.1f, groundMask);
     if (isGrounded)
     {
         verticalVelocity.y = 0;
     }

     Vector3 horizontalVelocity = (transform.right * horizontalInput.x + transform.forward * horizontalInput.y) * speed;
     controller.Move(horizontalVelocity * Time.deltaTime);

     // Jump: v = sqrt(-2 * jumpHeight * gravity)
     if (jump)
     {
         if(isGrounded)
         {
             verticalVelocity.y = Mathf.Sqrt(-2f * jumpHeight * gravity);
         }
         jump = false;
     }

     verticalVelocity.y += gravity * Time.deltaTime;
     controller.Move(verticalVelocity * Time.deltaTime);
 }

 public void RecieveInput (Vector2 _horizontalInput)
 {
     horizontalInput = _horizontalInput;
 }

 public void OnJumpPressed ()
 {
     jump = true;
 }

} and here is the code for the input manager:

 [SerializeField] Movement movement;
 [SerializeField] MouseLook mouseLook;
 [SerializeField] GunMechanics gun;

 PlayerControls controls;
 PlayerControls.GroundMovementActions groundMovement;

 Vector2 horizontalInput;
 Vector2 mouseInput;

 private void Awake()
 {
     controls = new PlayerControls();
     groundMovement = controls.GroundMovement;

     // groundMovement.[action].performed += context => do something
     groundMovement.HorizontalMovement.performed += ctx => horizontalInput = ctx.ReadValue<Vector2>();

     groundMovement.Jump.performed += _ => movement.OnJumpPressed();

     groundMovement.MouseX.performed += ctx => mouseInput.x = ctx.ReadValue<float>();
     groundMovement.MouseY.performed += ctx => mouseInput.y = ctx.ReadValue<float>();

     groundMovement.Shoot.performed += _ => gun.Shoot();
 }

 private void Update()
 {
     movement.RecieveInput(horizontalInput);
     mouseLook.RecieveInput(mouseInput);
 }

 private void OnEnable()
 {
     controls.Enable();
 }

 private void OnDestroy()
 {
     controls.Disable();
 }

}

While this code works, I found a problem with it. When I spam the WASD a bunch of times, both mouseLook and movement get stuck for some reason. As in, I am stuck moving in one direction and can't rotate the camera until I input the same direction I am stuck in.

This is a huge problem when implementing this movement in a movement shooter. Is there any way to fix this?