Board Thread:Support Requests - Getting Technical/@comment-5558012-20161120175149/@comment-24473195-20161120194709

It is a known issue of category collation. Categories sort alphabetically not numerically, and it uses each character to make the comparison. Wikis here are probably out of luck, as this was only fixed in recent mediawiki versions:

https://phabricator.wikimedia.org/T8948

It is also far more complicated than that, as different language scripts use different collations. Although, it is theoretically possible to use sortkey hacks to try to sort it ..