Category listing jerks to the right after load, as seen here:
I don’t generally see this on the first load, but subsequent reloads of /latest will do the trick. I had trouble seeing this on Meta for a while (until literally writing this topic), but it happens consistently on my forum (and apparently on Meta now, for me).
Found using Chrome/Win7 desktop, reproduced on Firefox. The effect is more pronounced the wider the window is. Only seems to occur while logged in, I don’t see this behavior when browsing anonymously. Nevermind, getting it anonymously on Firefox and Chrome now without much effort.