This problem is reproducible on the Ukrainian Wikipedia.
Some Ukrainian page names do not appear in the correct order when listed in anĵ category. The problem is about letters "Єє", "Іі", "Ґґ" and probably some others. Right now pages whose names start with "Є" and "І" appear before the rest of the alphabet and the whose that start with "Ґґ" - after the rest of the alphabet. The correct order should be the following:
А а
Б б
В в
Г г
Ґ ґ
Д д
Е е
Є є
Ж ж
З з
И и
І і
Ї ї
Й й
К к
Л л
М м
Н н
О о
П п
Р р
С с
Т т
У у
Ф ф
Х х
Ц ц
Ч ч
Ш ш
Щ щ
Ь ь
Ю ю
Я я
Version: unspecified
Severity: enhancement