Foreword and Forward are not interchangeable

I have in front of me a hardcover book called The Fred Factor. It is written by Mark Sanborn and the ISBN is 9780385513517. On the cover of the book: "with a Foreword by John C. Maxwell". On the Foreword page, the title is Foreword. Yet on the Contents page, as you can see above, it's written incorrectly as Forward.