Well, that was strange. I have no idea what caused it, but Blogger seems to have done it all by its own self.
When I got home from work and dinner, I logged in to check the blog. Lo and behold, there were six articles at the top of the page. Articles that I hadn't posted.
Well, actually, literally speaking, I did post them, but I posted them over two weeks ago (not between 6 and 7 pm today, like they were stamped). For some reason, Blogger picked them up and re-posted them as if they were new today -- and it posted one of them three times.
Sorry for the confusion. Let's hope whatever caused the hiccup has been cured.