duplicate 'new chapter' added into TOC

Thanks alot for that Keith. I’ve tried that but I can’t find any signs of hidden breaks and the page layout looks fine. The weird thing is that if I add an early chapter to test it, there it does the same - adding into the TOC an entry “Chapter One:”, then the new file. This then increments the rest of the unwanted chapter headings. There is also a new page created in the text of the book, “Chapter One:”, …

I’d prefer not to have to resort to adding them all to one folder. If you or anyone has any other ideas I’d really so appreciate hearing them

best wishes and thanks so much for your time and efforts
Paul