Articles with coauthors show up multiple times

[i-am-david-liu]

Describe the bug
Articles with coauthors show up multiple times in "related articles" section.

To Reproduce
Go to an article with multiple authors and check the "related articles" section.

Expected behavior
Articles with coauthors should only show up once.

Screenshots

From https://poly.rpi.edu/news/2019/10/family-weekend-closes-with-gm-pu-brunch/