pagination problem

Why is my ci pagination returns html looked like this when I viewed the source
<ul class="pager_wrap"><li><a href="#" class="pager_style current">1</a></li><li><a href="/user/my_account/2" data-ci-pagination-page="2">2</a></li><li><a href="/user/my_account/3" data-ci-pagination-page="3">3</a></li><li><a href="/user/my_account/2" data-ci-pagination-page="2" rel="next">Next</a></li></ul>

and it prints the html elements on webpage like this 

[font=Helvetica, Arial, 'Hiragino Kaku Gothic Pro', 'ヒラギノ角ゴ Pro W3', メイリオ, Meiryo, 'ＭＳ Ｐゴシック', Verdana, sans-serif]<ul class="pager_wrap"><li><a href="#" class="pager_style current">1</a></li><li><a href="/user/my_account?per_page=2" data-ci-pagination-page="2">2</a></li><li><a href="/user/my_account?per_page=3" data-ci-pagination-page="3">3</a></li><li><a href="/user/my_account?per_page=2" data-ci-pagination-page="2" rel="next">Next</a></li></ul>[/font]

[font=Helvetica, Arial, 'Hiragino Kaku Gothic Pro', 'ヒラギノ角ゴ Pro W3', メイリオ, Meiryo, 'ＭＳ Ｐゴシック', Verdana, sans-serif]this is my configuration for pagination:[/font]

PHP Code:

$config = array(
            'base_url'         => '/user/my_account',
            'total_rows'       => $total_row,
            'per_page'         => 2,
            'use_page_numbers' => TRUE,
            'num_links'        => $total_row,
            'num_tag_open'     => '<li>',
            'num_tag_close'    => '</li>',
            'cur_tag_open'     => '<li><a href="#" class="pager_style current">',
            'cur_tag_close'    => '</a></li>',
            'next_tag_open'    => '<li>',
            'next_tag_close'   => '</li>',
            'full_tag_open'    => '<ul class="pager_wrap">',
            'full_tag_close'   => '</ul>',
            'next_link'        => 'Next',
            'prev_link'        => 'Previous',
            'anchor_class'     => 'class="pager_style"',
            'page_query_string'=> TRUE

        ); 


I got it now.
I am using twig template engine and it cannot render raw html.

So i just changed
{{ pagination_links }}
to
{{ pagination_links | raw }}
so twig can render raw html