format problem while compiling .mobi

I’ve been trying to export/compile a Ms but I can’t get around something in the formatting stage. The final document is a collection of short stories - ‘format as’ custom since the final document is a .mobi. It has a collection of files in a folder - each, a short story and each is listed in the contents. The cover art has been added, successfully, too. The problem is with the final list of contents in the .mobi.
The first is 'Chapter One - Unknown Document(?) and then, Chapter Two - Title Page". I’ve followed the interactive tutorial, scrolled through the forums and found all is as clear as, well, mud. Can you help?