We frequently get emails from people who have run into issues when creating a chapter where somehow something is not behaving. For example, pages duplicating, page order is incorrect, missing pages, pages not updating, etc!
Our development team is constantly trying to improve the experience to make your lives easier. But just like how people say "have you tried rebooting your computer", when you run into a chapter issue, first try deleting that chapter and re-uploading your files!
Unfortunately lots of things can impact the upload process that we cannot anticipate!