Booktitle and frontmatter appear twice in output PDF file
I have been confused for a few days. If I publish a bookmap into PDF with my self-defined style-sheet, the book-title and the front-matter will appear twice! They will appear at the start of the book (It is correct), and appear again at end of book (It is not what I expect).
However, if I publish the bookmap file with default style-sheet, the result is correct—they just appear at the start. I try to adjust the style sheet many times. It seems I didn’t know where to solve it.
I don’t know how to control it – how to remove them from the end of the books. Can somebody help to answer it?

