If your document is being printed double sided, tabs cannot be inserted after odd numbered pages (e.g. pages 1, 3, 5, 7, 9 etc.)
Example - 20 page double sided document
Tab 1: page 2 (tab is placed between pages 2 and 3)
Tab 2: page 10 (tab is placed between pages 10 and 11)
Tab 3: page 15 (as this page is an odd number, the tab is placed after the next even page, which is page 16)
If you need to add a tab after an odd page, please edit your file, insert a blank page and re-upload. The tab can then be placed after the even numbered blank page.
Example with blank page added:
<new blank page - page 16>