So earlier today I posted the "Six Weird Things" and "Knitting Inspiration" posts. Suddenly, my sidebar was not, in fact, at the side, but at the bottom. I couldn't figure out what to do to fix it, but found a similar problem on the WordPress Support site indicating that there was "offensive code" in a post that broke the sidebar. So I deleted my two posts from today (which also deleted comments) and re-published them. Yes, if you looked at the site earlier, they were in a different order, and slightly different.
Anyway, my sidebar is back where it belongs now, but I have no clue how this happened. I'm going back to knitting now.