Over the course of the past couple of days, I have noticed random books are showing publisher names in the series field. No librarian seems to be adding these (per the log) and when I remove them, another one appears.

Example: https://app.thestorygraph.com/books/1a6966fd-5552-4166-ab8b-dd858414c315

You can see I've removed a random series from this book twice and they keep reappearing (it has one now).