you maight have noticed that the same happens if you view the latest post as a single post; http://ancestorsinaprons.com/2015/03/52-ancestors-9-joseph-kaser/
there is possibly something wrong in the content of that post, maybe from partially deleting some parts, or from some copy/paste.
the section ‘notes on research’ seems to contain html code which dupicates some html structure of the theme – how did you add that section?
You nailed it! Thanks! I had cut and pasted from a prior use of that section in another post, and unknowingly got extra code. Saw it when I went into “text view” and removed it. All is fine now. Really appreciate your help!!