Php versions – Why does CODEIGNITER lost session after redirect to other controller by using "redirect" function?

I am learning codeigniter. I am trying to code login system and after perfect login I want to redirect the page to another controller. After redirect, I can’t get user session data. However when i manually go that page i can get the session data. Is there a solution?

what i have done for session:

$this->session->set_userdata('userid', $user->user_id); //in login controller

echo "userid: ".$this->session->userdata('userid'); // in profile controller

codigniter version : 3.1.11
php version : 7.3.7

Note: Ive tried all the solution in the internet about "session.php"

EDIT:

  class Profilim extends CI_Controller
   {  
      public function index() 
      {          
         
         echo "profilim userid: ".$this->session->userdata('userid');
      } 
   } 


   class Giris extends CI_Controller
   {  

      public function index() 
      { 
         
         $this->load->model("GirisModel");



         if($this->input->post('giris')){

            $data["loginmessage"] = "";
            $data["login_status"] = false;

            $email = $this->input->post('email');
            $password = $this->input->post('password');

            $result = $this->GirisModel->isUserExist($email,$password);
            

            if($result->num_rows()){
               $data["loginmessage"]="Giriş Başarılı!";
               $data["login_status"]=true;

               $user = $result->row();
               
               $this->session->set_userdata('userid', $user->user_id);

               
   
               /*Redirect the user to some internal controller’s method*/ 
               redirect('Profilim','refresh'); 

            }
            else{
               $data["loginmessage"]="Yanlış şifre veya kullanıcı adı!";
               $data["login_status"]=false;
            }
            $this->load->view("giris",$data);
         }else{
            $this->load->view("giris");
         }
         
      } 
   }