unity doesn't detect space for me sometimes randomly

when I'm testing the first person character and I want to jump if I don't move the camera or I don't move it just doesn't jump

using System.Collections; using System.Collections.Generic; using UnityEngine;

//Requeriments [RequireComponent(typeof(Rigidbody))]

public class PlayerController : MonoBehaviour { // //Variables //

 //Components
 Rigidbody rb;

 //Movement
 [Header("Movement")]
 [SerializeField] float speed;

 Vector3 movePlayer;
 Vector3 rightCamera;
 Vector3 forwardCamera;

 //Look
 [Header("Look")]
 [SerializeField] Transform camTransform;
 [SerializeField] float MaxAngleVertical;

 float verticalLook;
 float horizontalLook;

 //Jump
 [Header("Jump")]
 [SerializeField] float jumpForce;
 [SerializeField] LayerMask jumpLayer;

 //-----------------------------------------------------

 // Start is called before the first frame update
 void Start()
 {
     //Initialize:
     rb = GetComponent<Rigidbody>();

     Debug.Log("Player Generated");
 }

 // Update is called once per frame
 void Update()
 {
     Look();
     Movement();
     Jump();

     rb.velocity = movePlayer;
 }

 //
 //Movement
 //
 void Movement()
 {
     //
     //Get Keyboard Input
     //

     Vector2 keyboardInput = InputManager.Instance.GetKeyboardAxis();

     //
     //Get Camera Angles
     //

     rightCamera = camTransform.right;
     rightCamera.y = 0;
     rightCamera = rightCamera.normalized;

     forwardCamera = camTransform.forward;
     forwardCamera.y = 0;
     forwardCamera = forwardCamera.normalized;

     //
     //Move
     //

     movePlayer = keyboardInput.x * rightCamera + keyboardInput.y * forwardCamera;
     movePlayer *= speed;

     //Gravity

     movePlayer.y = rb.velocity.y;

     
 }

 //
 //Look
 //
 void Look()
 {
     //
     //Get Mouse Input
     //

     Vector2 mouseInput = InputManager.Instance.GetMouseAxis();

     //
     //Look
     //

     //Vertical Look

     verticalLook -= mouseInput.y;
     verticalLook = Mathf.Clamp(verticalLook, -MaxAngleVertical, MaxAngleVertical);
     camTransform.rotation = Quaternion.Euler(verticalLook, camTransform.rotation.eulerAngles.y, 0);

     //Horizontal Look

     horizontalLook += mouseInput.x;
     transform.rotation = Quaternion.Euler(0, horizontalLook, 0);
 }

 //
 //Jump
 //
 void Jump()
 {
     if (!IsGrounded().transform) return;

     Debug.Log("Grounded");

     if (!InputManager.Instance.PressJump()) return;

     Debug.Log("Jump");
     movePlayer.y = jumpForce;
 }


 /// <summary>
 /// Is true if player is in touching ground
 /// </summary>
 /// <returns></returns>
 public RaycastHit IsGrounded()
 {
     Ray r = new Ray(transform.position, -transform.up * 1.3f);
     RaycastHit hit;
     Debug.DrawRay(transform.position, -transform.up * 1.3f);
     Physics.Raycast(r, out hit, jumpLayer);
     return hit;
 }

}