Problems with the_author_posts_link

I’m finding that on a somewhat random case by case situation that “the_author_posts_link” doesn’t link to the author’s page of their posts, but links to the url that they have set as their home page.

An example (https://www.myconfinedspace.com/tag/legos/)
The first two are linking as expected, straight to the author’s page.
The third one is linking to the user’s url.

Any ideas on what’s going on here?