Posts displaying twice on single.php

For some reason some of my posts display twice on single.php for some of my posts, but not others.

Double: https://internationalglobe.com/world-news/al-jazeera/karzai-hits-out-over-afghan-deaths

Single: https://internationalglobe.com/3040

It’s as if for some posts the <?php if (have_posts()) : while (have_posts()) : the_post(); ?> is running twice.

Update: It may be on posts that had duplicates originally, but persists after the duplicates are deleted.