uploading comments

Hello!
Can not make the Inquisitor’s comments by clicking on the button.
That is, you want to display 5 comments and click download again, by clicking on that outputs another 5 etc.

I get comments like this: (this is when we clicked to load more comments)

<?php
$args_list = array(
		'callback' => 'mytheme_comment',
	);

	$args = array(
		'order' => 'ASC',
		'offset' => $offset,
		'number' => $items,
		'post_id' => $post_id,
	);
	$comments = get_comments($args);

	wp_list_comments($args_list, $comments);
?>

Accordingly, within the parameters of offset, number and post_id transmitted desired values.
But when you use the number broken Outline (nested) comments