My player jumps when going up a slope, but he must walk straight without jumping

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My player jumps when going up a slope, but he must walk straight without jumping and he sliding when staying on the slope. how to fix that?
Here is the player movement code:
using UnityEngine;

public class PlayerController : MonoBehaviour
{
private Rigidbody rb;
private CapsuleCollider player;
[Header(“Floats”)]
public float speed = 7f;
public float Forcejump = 5f;
public float runspeed = 13f;
public float height = 0.5f;
public float crouchspeed = 3f;
[Header(“Bools”)]
public bool isGrounded = false;
public bool isSprinting = false;
public static bool isCrouching = false;

private void Start()
{
    rb = GetComponent<Rigidbody>();
    player = GetComponent<CapsuleCollider>();
}

private void Update()
{
    if (Input.GetKeyDown(KeyCode.C) && isSprinting)
    {
        player.height = height;
        Invoke("Sliding", 0.7f);
    }


    Ray ray = new Ray(transform.position, -transform.up);

    if (Physics.Raycast(ray, 1.3f))
    {
        isGrounded = true;
    }
    else
    {
        isGrounded = false;
    }

    if (Input.GetKeyDown(KeyCode.Space) && isGrounded && !isCrouching)
    {
        rb.AddForce(Vector3.up * Forcejump, ForceMode.Impulse);
    }
    if (Input.GetKeyDown(KeyCode.C) && !isSprinting)
    {
        isCrouching = true;
        player.height = height;
    }
    if (Input.GetKeyUp(KeyCode.C) && !isSprinting)
    {
        isCrouching = false;
        player.height = 2;
    }
}
private void FixedUpdate()
{
    float v = Input.GetAxis("Vertical") * speed;
    float h = Input.GetAxis("Horizontal") * speed;
    float runV = Input.GetAxis("Vertical") * runspeed;
    float runH = Input.GetAxis("Horizontal") * runspeed;
    float crouchV = Input.GetAxis("Vertical") * crouchspeed;
    float crouchH = Input.GetAxis("Horizontal") * crouchspeed;

    if (Input.GetKey(KeyCode.LeftShift) && !isCrouching)
    {
        isSprinting = true;
        rb.velocity = transform.TransformDirection(new Vector3(runH, rb.velocity.y, runV));
        
    }
    else if (isCrouching)
    {
        rb.velocity = transform.TransformDirection(new Vector3(crouchH, rb.velocity.y, crouchV));
    }
    else
    {
        
        rb.velocity = transform.TransformDirection(new Vector3(h, rb.velocity.y, v));
        isSprinting = false;
    }
}
void Sliding()
{
    isCrouching = false;
    isSprinting = false;
    player.height = 2;
}

}