I imported my BookyAI Word (DOCX) export into Kindle Create and "Chapter 1", "Chapter 2" and so on each sit alone on a page, with the chapter title on the next page without its number. How do I fix this?

Update to BookyAI version 1.9.10 or later and export the DOCX again. Kindle Create splits a book at every chapter heading and inserts its own page break in front of it. Earlier versions of BookyAI wrote the "Chapter N" label as a separate line above the heading, so Kindle Create's page break fell between the label and the title. Since 1.9.10 the label and the title are one heading that carries its own page break, so Kindle Create shows "Chapter 1: Your Title" as a single numbered chapter starting on a fresh page. Your text does not need to change; simply export again after updating and import the new file.