Player is flying in the air at the start

Player is flying in the air at the start. Why?

Here’s my code:

using UnityEngine;

public class PlayerMovement : MonoBehaviour {

	// This is a reference to the Rigidbody component called "rb"
	public Rigidbody rb;

	public float forwardForce = 2000f;
	public float sidewaysForce = 500f;

    // Start is called before the first frame update
    void FixedUpdate()
    {
	  
	 	 // Add a forward force
	  	rb.AddForce(0, 0, forwardForce * Time.deltaTime);
	  
	  	if ( Input.GetKey ("d") )
	  	{
	  	  rb.AddForce(sidewaysForce * Time.deltaTime, 0, 0);
	  	}
	  
	   	if ( Input.GetKey ("a") )
	  	{
	  	   rb.AddForce(-sidewaysForce * Time.deltaTime, 0, 0);
	  	}
    }  
}

Could you provide the screenshot All component you are using.
at player