Flickering view on merge request page

Screen capture

Aftermath screenshot (which may contain hints)

Notice how the circle avatars are not where they are supposed to be

Steps to reproduce

1. Go to gitlab-com/www-gitlab-com!6577 (diffs, comment 33532827)
2. Scroll all the way to the bottom
3. Click on the changes tab

Browser

Google Chrome Version 59.0.3071.115 (Official Build) (64-bit)

Screen Resolution

1280px x 698px

Unsure whether this is a new regression on 9.3.1 or not