Showing related posts twice in a post

I want to show related posts’ block twice in a post. In and below the post.

1. I’ve written a plugin that injects <?php zemanta_related_posts(); ?> into the post automatically, after 3rd image.
2. And Auto Insert Related Posts is checked in option page.

Now it’s showing 2 related posts’ block but no posts in second block.

Note: I’ve tried adding <?php zemanta_related_posts(); ?> twice in template file, same thing happens!

https://www.ads-software.com/plugins/related-posts-by-zemanta/