Pagination only displays the first 10 records

I think the problem is in your base_url from pagination library.
test this.

Code:

 $config = [
       'base_url' => site_url(site_url(uri_string(2)),
        'uri_segment' => 3

I think that you wil have a problem with limit functionality later.
so when you call

Code:

$this->Customer->getCustomers($config['per_page'], $this->uri->segment($config['uri_segment']));

change it for :

Code:

$this->Customer->getCustomers($config['per_page'], $this->uri->segment($config['uri_segment'])*$config['per_page']);