Spam jumping.

So I tried to make the player jump but if i press space in the air he still jumps.
How do I fix this?
Scripts:
player script

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

public class Player : MonoBehaviour {
    public float maxspeed = 3;
    public float speed = 50f;
    public float jumppower = 500f;
    float size = 0.16f;
    public bool grounded;
    private Rigidbody2D rb2d;
    private Animator anim;
    
    
	void Start () {
        //player movement
        rb2d = gameObject.GetComponent<Rigidbody2D>();
        anim = gameObject.GetComponent<Animator>();
	}

    void Update()
    {

        anim.SetBool("Grounded", grounded);
        anim.SetFloat("Speed", Mathf.Abs(Input.GetAxis("Horizontal")));
        if (Input.GetAxis("Horizontal") < -0.1f)
        {
            transform.localScale = new Vector3(-size , size , size);
        }
        if (Input.GetAxis("Horizontal") > 0.1f)
        {
            transform.localScale = new Vector3(size, size, size);

        }

        if (Input.GetButtonDown("Jump") && grounded)
        {
            rb2d.AddForce(Vector2.up * jumppower);
        }

    }
    void FixedUpdate()
    {

        float h = Input.GetAxis("Horizontal");
        //limiting the speed
        rb2d.velocity = new Vector2(h * maxspeed, rb2d.velocity.y);
        
        rb2d.AddForce((Vector2.right * speed) * h);

        if (rb2d.velocity.x < -maxspeed)
        {
            rb2d.velocity = new Vector2(-maxspeed, rb2d.velocity.y);
        }


    }
}

groundcheck script

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

public class GroundCheck : MonoBehaviour{
    private Player player;

    void Start()
    {
        player = gameObject.GetComponentInParent<Player>();
    }

    void OnTriggerEnter2D(Collider2D col)
    {
        player.grounded = true;
    }

    void OnTriggerStay2D(Collider2D col)
    {
        player.grounded = true;
    }

    void OnTriggerExit2D(Collider2D col)
    {
        player.grounded = false;
    }
}


Good day.

Where are these scripts attached? Post an image of the inspector please.
You are using

     player = gameObject.GetComponentInParent<Player>();

So i supose they are not in the same object, they are ina a child and ina parent object…
IF you want to access a a script in the same object, you need

     player = gameObject.GetComponent<Player>();

Bye!