@sod @JohnPhilpin @manton It's difficult to see that there's anything wrong here, per se, rather that your site is being rebuilt as per normal and you happen to see the wrong number during that process.

Manton previously wrote an explanation of how Micro.blog handles publishing and updates and whatnot. If you look at the eighth paragraph onwards you can get an idea of how rebuilds priorities the newest posts before anything else, including pages such as Archive and Categories.