It's odd but it's probably not because of the name change because it appears that the posts are ordered by date but for some reason, the 0.21.2 version was posted on the 26th of October while the newest versions were posted prior to that date.
Ou.. ok maybe it was not about version number. It can be because of certifigate and maybe they did re-sign old ones also.
The order is that way because 0.20.2 and 0.21.2 were released after 22.0. There will still be minor releases for some older versions. These include bug and security fixes.