I figured out the problem yesterday. In the post itself, under FORMAT (right column in WordPress), LINK was selected instead of STANDARD. Not sure how that happened, but it did. With LINK selected, the entire post showed up on the blog roll – but only that post. I changed it back to STANDARD and the problem went away.
Indeed, you are correct – I have never selected those other formats.
Website: www.stopmandatoryvaccination.com/our-stories