Not really a "site help" post, just reporting this case that _might_ be a bug in the comment thread section.
If user's avatar/profile image is in portrait orientation (taller than it's wide), it's not cropped into a square. If someone has eg. 100 x 800px avatar, it would stretch the comment container height and make the layout look funny.
(You folks can probably tell i'm trying to procrastinate from doing that exercise by filing this bug report!! 🙈)