In my novel, the Author's Note and the Acknowledgments moved to the end of the book. Why?

From version 1.9.20 the standard order of the front and back matter follows the kind of book. Novels usually print the Author's Note and the Acknowledgments at the back, after the Epilogue, and BookyAI now does the same for fiction. Non-fiction keeps them at the front, as before. This changes only books whose order you never arranged yourself. To put them back at the front, press "Reorder" on the book's page and use "Move before the chapters" on each, then "Apply new order", or rearrange them in the Export card's "Include in book and order" list.