Comment page problem

Hello.
I use this on my category.php
It show comment well.
Everything seems to be good.
But When I type comment, it show error 404 or 409.
“Comment stop”
If I refresh page the comment show result. It’s not bad.

The error code show like this.
jquery.js?ver=1.11.2:4 GET https://sitename.com/?enhanced-category=222 404 (Not Found)
My category page is https://sitename.com/?cat=2.
But “submit buttom” lead to /?enhanced-category=222
how to handle this?
I don’t make that page. this plugin don’t make that page also.

this is the source what I use.

<?php
global $blogConf;
get_template_part(‘page’, ‘defaults’);
//here. category name delete
$blogConf[‘title’] = __(“”, “themeton”) . ” ” . single_cat_title(“”, false);
$blogConf[‘teaser_text’] = category_description();
get_header(); ?>
<?php
//$categories is presumed to be an already fetched array of categories/terms
foreach($categories as $category) {
$GLOBALS[‘enhanced_category’]->setup_ec_data($category->term_id);
the_post_thumbnail(‘thumbnail’);
}?>
<?php
global $enhanced_category;
//get enhanced category post and set it up as global current post
$enhanced_category->setup_ec_data();
?>
<!– enhanced category content –>
<?php the_post_thumbnail(“medium”); ?>

<?php get_template_part( ‘content’, ‘page’ ); ?>

<!– custom fields –>
<?php
get_post_custom();
?>

<?php
// If comments are open or we have at least one comment, load up the comment template
if ( comments_open() || get_comments_number() ) :
comments_template();
endif;
?>

<section id=”page” class=”clearfix”>
<div class=”content”>
<div id=”masonry” class=”clearfix”>

<div class=”mansonry-container”>
<!– start here new category –>

<!– Start Featured Article –>
<?php get_template_part(‘loop2’);?>
<!– End Featured Article –>
</div>
<?php infiniteScroll(); ?>
</div>
</div>
</section>
<!– End Page –>
<?php get_footer(); ?>

https://www.ads-software.com/plugins/enhanced-category-pages/