There's a small difference in the alignment of site icons in the achievements dialog between https://stackexchange.com and the Q&A sites. On the latter (left screenshot), they are well aligned vertically with the score / badge and the question title (directly adjacent to one another); on the former (right screenshot), they are a bit out of sync (the site icons are higher than the score/ badge), which is slightly annoying.
It's a bit like this bug from 2017 but that was fixed 6-8 months later.