WordPress Post Excerpts Displaying Twice

I'm using the Display Posts Shortcode plugin to pull excerpts into a WordPress Index.php template in a child theme of Twenty Thirteen.

This is the shortcode:

<?php echo do_shortcode( '[display-posts include_excerpt="true" post_status="publish" posts_per_page="3" wrapper="div"]' ); ?>

I have very few arguments. When I turn off the argument to include the excerpts, only the titles display twice.

I've turned off every plugin and that did not solve the issue. Any ideas?

via Chebli Mohamed