The notebook is not faulty, this is how the book was designed. Every Notebook has 'secret pages' which must be opened using a special tool like a knife or letter opener.
Once you have cut open the secret pages you will find that the page numbers are now in the correct sequence.
Please take care when cutting the pages to avoid any unwanted tearing. Some pages are also designed to fold-out, so be careful not to cut any of these pages

Opening the hidden pages using a knife
Once you have cut open the secret pages you will find that the page numbers are now in the correct sequence.
Please take care when cutting the pages to avoid any unwanted tearing. Some pages are also designed to fold-out, so be careful not to cut any of these pages

Opening the hidden pages using a knife