问CI分页偏移量没有显示正确的值

EN

$active = 1;
$total = $this->all_users_model->total_number_of_rows();
$per_page = 10;
$offset = ($this->uri->segment(3)) ? $this->uri->segment(3) : 0;

$config['base_url'] = base_url().'admin/manage-users/';
$config['total_rows'] = $total;
$config['per_page'] = $per_page;
$config['use_page_numbers'] = TRUE;
$config['num_links'] = $total;
$config['full_tag_open'] = '<div id="pagination">';
$config['full_tag_close'] = '</div>';
$config['first_link'] = 'First';
$config['prev_link'] = 'Previous';
$config['next_link'] = 'Next';
$config['last_link'] = 'Last';

$this->pagination->initialize($config);
$data['admin_all_users'] = $this->all_users_model->show_all_user_details($active, $per_page, $offset);

public function show_all_user_details($active,$per_page,$offset) {
    $this->db->where(array('activated'=>$active,'admin !='=>1));
    $this->db->limit($per_page,$offset);
    $this->db->order_by('api_id','desc');
    $query=$this->db->get('registered_members');
    return $query->result();
}