The session id is fixed even if you change the browser and device

I use curl but on the other page the session id remains constant and does not change and I changed the browser or device and the same result

Curl Code :

    session_start();
    $Request = curl_init();
    curl_setopt($Request, CURLOPT_URL,'##################');
    curl_setopt($Request, CURLOPT_RETURNTRANSFER, true);
    curl_setopt($Request, CURLOPT_COOKIEJAR, 'Sessionsd.txt');
    curl_setopt($Request, CURLOPT_COOKIEFILE, 'Sessionsd.txt');
    curl_setopt($Request, CURLOPT_ENCODING, '');
    curl_setopt($Request, CURLINFO_HEADER_OUT, true);
    curl_setopt($Request, CURLOPT_CUSTOMREQUEST, 'POST');
    curl_setopt($Request, CURLOPT_POST, 1);
    curl_setopt($Request, CURLOPT_POSTFIELDS,$RequestData);


    $Result = curl_exec($Request);
    if ($Result === false)
    {
        echo 'Curl error: ' . curl_error($Request);
        return false;
    }
    else
    {
        $json_response = $Result;
    }

    curl_close ($Request);

    print_r($json_response);

other Page :

    if(!isset($_SESSION)){
        ini_set('session.save_path', '../Sessions');
        session_start();
        session_regenerate_id();
        $_SESSION['ahmed'] = "fwfwef";
    }
    
    $session_id = $SessionID = session_id();

How Can fix it ?