I apologize for somewhat repeating this old question, but I haven’t found an answer so far 🙁
I setup my blog so that new user default role = Author.
This happened to me twice recently: I noticed a new user registering (without posting anything). Later on, whenever I myself post or edit something, the new/edited post (or page) is now granted this new username as an Author.
Is this some kind of hack? How can I fix that? Also: Is there a way for myself, as the Admin, to edit the author username of an existing post/page?
Well, at least for the last question (“Is there a way for myself … to edit the author username …”) I found a quick cure, by accessing directly the database, and changing back the value of ‘post_author’ in table ‘wp_posts’ wherever appropriate.
As for why the problem occurs at the first place, I am still very puzzled.