YARPP Post Duplicate Related Articles

Hi all,
I have disabled Automatically display of yarpp posts, I have cleared wp_yarpp_related_cache table and I have inserted this code in single.php file:

<?php
    echo related_posts();
    ?>

I have always two times the related posts. Is there a solution?

I have WordPress 3.5.1. and YARPP 4.0.8

An example post https://goo.gl/YvRqo2

Thank you very much,

Andrea

https://www.ads-software.com/plugins/yet-another-related-posts-plugin/