We are sorry for the trouble. As described you want to change the page numbers of the PDF file and you are using Adobe Acrobat 9 Pro
Adobe Acrobat 9 Pro is an old and EOL application. It may or may not work properly. Adobe strongly recommends that customers upgrade to the latest versions of Adobe Reader and Adobe Acrobat. By upgrading installations to the latest versions, customers benefit from the latest functional enhancements and improved security measures.