Why is not showing the last 5 comments

I have this code which shows the last 5 comments. Since the plugin is actually importing the facebook comments on my DB. Why is not working this script?

<div class="tabs-post">

<?php
//show recent comments
$sql = "SELECT DISTINCT ID, post_title, post_password, comment_ID, comment_post_ID, comment_author, comment_author_email, comment_date_gmt, comment_approved, comment_type, comment_author_url, SUBSTRING(comment_content,1,70) AS com_excerpt FROM $wpdb->comments LEFT OUTER JOIN $wpdb->posts ON ($wpdb->comments.comment_post_ID = $wpdb->posts.ID) WHERE comment_approved = '1' AND comment_type = '' AND post_password = '' ORDER BY comment_date_gmt DESC LIMIT 5";
$comments = $wpdb->get_results($sql);
foreach ($comments as $comment) :
?>
<div class="tab_inside">
<a>ID); ?>#comment-<?php echo $comment->comment_ID; ?>"><?php echo get_avatar( $comment, '53' ); ?></a>
<div class="content"><h1><a>ID); ?>#comment-<?php echo $comment->comment_ID; ?>"><?php echo $comment->post_title; ?></a></h1>  <span class="date"><?php echo strip_tags($comment->com_excerpt); ?></span></div><!-- #content closer -->
</div><!-- #tab_inside -->
<?php endforeach; ?>
<?php wp_reset_query(); ?>

</div>

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https://www.ads-software.com/plugins/seo-facebook-comments/