I was on the page for Scalzi's Lock In and clicked the series link to find out the name of the associated novella. When the series page appeared, one of the Agatha H graphic novels (A. H. and the Clockwork Princess) appears as a part of the series. I looked at the series info in the editing sections of all three books and can't see anything that would make Agatha H appear. Anyway, here's the link to the page I saw

 https://www.worldswithoutend.com/searchwwe.asp?st=Lock+In&t=1&at=All&gid=0&ys=0&ye=9999

Hey Rhonda, that is an expected weirdness.  The series link is simply a search request launched from the novel page as if you typed the series name into the search field at the top of the page which searches titles, series names and authors in the DB.  It therefore brings back the same results set which includes other books with the words "lock" AND "in" in them.  In this case  Agatha H and the CLOCKwork PrINcess.

Most of the time you'll get exactly what you expect from those links because the series name is usually more complex or more specific like "Harry Potter" or "The Foundation Series" etc.  If we listed the latter as just "Foundation" for the series name you'd get 14 results from that link.  If we added an author named "Harry Potter" all his books would then show in the result set and we would rename the series to "Harry Potter Series" to compensate.

In this case I've added "Series" to the series title so you'll only get Scalzi's books when you click on "Lock In Series" from the novel page. Now you'll get what you expect.