An extra page is added in the MS IE 6 or MS IE 7 browser
Most probably, you have not deleted a comma at the end of the final page in your pages list in the file js/bookSettings.jsflippingBook.contents = [ [ "Cover", 1 ], [ "Modern", 4 ] ];
Help > HTML Edition > FAQ > An Extra Page Is Added In The Ms Ie 6 Or ...
flippingBook.contents = [ [ "Cover", 1 ], [ "Modern", 4 ] ];