why all queries fire twice?

   
why all queries fire twice? i am using jamie rumbelow's MY_model as base model. see the attachment

 this is my controllers index method:

PHP Code:

public function index($page = 0)
    {

        $this->load->library('pagination');

        $config['base_url'] = base_url() . 'masters/hourly_budget/index';
        $config['total_rows'] = $this->hourly_budget_model->count_all();
        $config['per_page'] = 10;
       
 $config['cur_page'] = $this->uri->segment(4);

 $this->pagination->initialize($config);
        $hourly_budget = $this->hourly_budget_model->limit($config['per_page'], $config['cur_page'])->get_all();

        $data['page_links'] = $this->pagination->create_links();
        $data['hourly_budget_data'] = $hourly_budget;
        $data['sr'] = $page;
        $this->template->render($this->default_layout, 'hourly_budget/hourly_budget_list_view', $data);
    } 


model:

PHP Code:

<?php 
defined('BASEPATH') OR exit('No direct script access allowed');


/**
 * Description of hourly_budget_model
 *
 * @author
 */
class hourly_budget_model extends MY_Model {
   protected $_table ="hourly_budget";
    
   
} 


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