Background removal issue

I created some images yesterday with a woman holding a book in her hands in front of her. When I removed the background, it also removed the book and made it transparent (as long as the book is not outside of the outline of the woman) which is exactly what I wanted. Today, it is no longer removing the book when I remove the background and if it does, or it is doing so poorly that it is not usable. Please can we revert back to what it was doing before, i.e. removing the book as well as the background.