There seems to be something wrong with the sorting of Stack Exchange sites by name:
elementary OS and Русский язык appear in the wrong place at the end of the list.
As @Xufox notes in the comments, they're sorted case-sensitive and that Р is not a Latin P but a Cyrillic 'R', so it's outside the Latin alphabet. I think that page was created while all Stack Exchange sites started with a Latin capital letter.
It does make sense to sort elementary OS between Electrical Engineering and Emacs, but Русский язык will never fit in. Or, alternatively, change the name to "Elementary OS". There are probably many elementary OS enthusiast who'd nail me to a cross for this, but Vi and Vim Stack Exchange also starts with a capital letter even though vi does not.