Sim only getting royalties for latest 3 books

Even though my sim has written about 7 books and published them, she was only getting royalties for the latest 3. I wasn't sure why I stop getting royalties for the other, but thought that maybe sims just stop getting royalties from books after some amount of time, so I wrote another book, published and the next day when I got my royalty report it was still the latest 3 books, though I was earning less because the book was worth less