codeigniter pagination strange problem!

Code:
public function view($region, $slug, $offset=0)

    {        

        $query = $this->question->get_question_by_slug($slug);

        $replies = $this->question->get_question_replies($query->id, $offset);

        $replies_total = $this->question->get_question_replies_total($query->id);

        

        



        // pagination links for replies

        $config['base_url'] = base_url().'/question/view/'. $region . '/' . $slug;

        $config['total_rows'] = $replies_total;

        $config['per_page'] = '10';

        $config['uri_segment'] = 4;

        $config['num_links'] = 2;

        $config['full_tag_open'] = '<p style="text-align:right">';

        $config['full_tag_close'] = '</p>';

        

        $config['num_tag_open'] = '<span class="page_num">';

        $config['num_tag_close'] = '</span>';

        

        $config['cur_tag_open'] = '<span class="page_num_cur">';

        $config['cur_tag_close'] = '</span>';

        

        $config['next_link'] = 'Next';

        $config['next_tag_open'] = '<span class="page_num">';

        $config['next_tag_close'] = '</span>';

        

        

        $this->pagination->initialize($config);

        $data['pagination'] = $this->pagination->create_links();

        $data['views'] = $this->question->get_views($data['question']->id);

        

        $this->load->view('temp_header', $data);

        $this->load->view('navigation');

        $this->load->view('temp_question_view');

        $this->load->view('temp_footer');

    }