I have a problem with Session. I have not experienced this problem on localhost or other servers. Only one.com has this problem. The session is defined and set to the specified session folder, but the session appears to be missing when the page is refreshed.

Login Page Code

$submitted = $this->input->post('email');
    $admin_logged_in = $this->session->userdata('admin_logged_in');
    if($admin_logged_in != true){
        if($submitted != ""){
            $email = xss_clean($this->input->post('email'));
            $password = xss_clean($this->input->post('password'));
            $id = $this->Admin_Model->admin_log($email,$password);
            if($id == 1){
                $user = $this->Admin_Model->get_admin($email);
                $data['user'] = $user;
                $session_data = array(
                    'admin_id'  => $user->id,
                    'admin_email'     => $user->email,
                    'admin_logged_in' => true
                );
                $this->session->set_userdata($session_data);
                redirect('admin');
            }else{
                $data['error'] = array( 'type' => 'error', 'message' => 'Account information is incorrect.');
                $this->load->view('admin/login',$data);
            }
        }else{
            $this->load->view('admin/login',$data);
        }
    }else{
        $user_id = $this->session->userdata('admin_id');
        $user = $this->Admin_Model->get_admin_id($user_id);
        $data['user'] = $user;
        $this->load->view('admin/admin_home',$data);
    }

İndex Page Code (Next page after login)

$admin_logged_in = $this->session->userdata('admin_logged_in');
    if($admin_logged_in == true){
        $user_id = $this->session->userdata('admin_id');
        $user = $this->Admin_Model->get_admin_id($user_id);
        $data['user'] = $user;
        $this->load->view('admin/admin_home',$data);
    }else{
        $this->load->view('admin/login',$data);
    }

Session Config

$config['sess_driver'] = 'files';
$config['sess_cookie_name'] = 'ci_session';
$config['sess_expiration'] = 7200;
$config['sess_save_path'] = 'ci_sessions'; // Or sys_get_temp_dir()
$config['sess_match_ip'] = FALSE; // Or True
$config['sess_time_to_update'] = 300;
$config['sess_regenerate_destroy'] = FALSE; // Or True

I am already grateful to the friends who can find a solution.