Pagination is not function properly.

My problem is that I want to use pagination for different pages but they are in one controller. The pagination for get_all_2017 is successful but the get_all_2018 does not function properly because when I click it only retrieve the first 100 values.

<?php

defined('BASEPATH') or exit('No direct script access allowed');

class Product extends CI_Controller
{

    public function _Construct()
    { 
        parent::__Construct();
        cek_login();
    }

    public function index($offset=0)
    {

        $this->load->library('pagination');
        $config['base_url'] = site_url('product/index');
        $config['total_rows'] = $this->M_product->countAll();
        $config['per_page'] = 100;

        $config['full_tag_open'] = '<ul class="pagination">';        
        $config['full_tag_close'] = '</ul>';        
        $config['first_link'] = 'First';        
        $config['last_link'] = 'Last';        
        $config['first_tag_open'] = '<li class="page-item">';        
        $config['first_tag_close'] = '</li>';        
        $config['prev_link'] = '«';        
        $config['prev_tag_open'] = '<li class="page-item">';        
        $config['prev_tag_close'] = '</li>';        
        $config['next_link'] = '»';        
        $config['next_tag_open'] = '<li class="page-item">';        
        $config['next_tag_close'] = '</li>';        
        $config['last_tag_open'] = '<li class="page-item">';        
        $config['last_tag_close'] = '</li>';        
        $config['cur_tag_open'] = '<li class="page-item active"><a class="page-link" href="#">';        
        $config['cur_tag_close'] = '</a></li>';        
        $config['num_tag_open'] = '<li class="page-item">';        
        $config['num_tag_close'] = '</li>';

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

        $data ['product17'] = $this->M_product->get_all_2017($config['per_page'],$offset);

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

        $this->template->load('back/template','back/product/data_product', $data);
    }

    public function get_product18($offset=0)
    {

        $this->load->library('pagination');
        $config['base_url'] = site_url('product/get_product18/index');
        $config['total_rows'] = $this->M_2018->countAll();
        $config['per_page'] = 100;

        $config['full_tag_open'] = '<ul class="pagination">';        
        $config['full_tag_close'] = '</ul>';        
        $config['first_link'] = 'First';        
        $config['last_link'] = 'Last';        
        $config['first_tag_open'] = '<li class="page-item">';        
        $config['first_tag_close'] = '</li>';        
        $config['prev_link'] = '«';        
        $config['prev_tag_open'] = '<li class="page-item">';        
        $config['prev_tag_close'] = '</li>';        
        $config['next_link'] = '»';        
        $config['next_tag_open'] = '<li class="page-item">';        
        $config['next_tag_close'] = '</li>';        
        $config['last_tag_open'] = '<li class="page-item">';        
        $config['last_tag_close'] = '</li>';        
        $config['cur_tag_open'] = '<li class="page-item active"><a class="page-link" href="#">';        
        $config['cur_tag_close'] = '</a></li>';        
        $config['num_tag_open'] = '<li class="page-item">';        
        $config['num_tag_close'] = '</li>';

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

        $data ['product18'] = $this->M_2018->get_all_2018($config['per_page'],$offset);

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

        $this->template->load('back/template','back/product/data_product18', $data);
    }

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

/**
 * 
 */
class M_product extends CI_Model
{
	public function get_all_2017($limit,$offset)
	{
		$this->db->limit($limit);
		$this->db->offset($offset);


		return $this->db->get('all_2017')->result();
	}

	function countAll()
	{
		return $this->db->get('all_2017')->num_rows();
        return $this->db->get('all_2018')->num_rows();
		
		
	}

	public function get_all_2018()
	{
	
        $this->db->limit($limit);
		$this->db->offset($offset);

		return $this->db->get('all_2018')->result();
	}

/table> <br>
                <?php echo $pagination; ?>
                    </div>