Once again, check to see how many pages your PDF file has (it's a good idea to have a count handy, but not a lot of people really do this.) Then try to delete only those pages that were not used. Also, in this particular issue, do not delete a page after you've already saved it with a different file extension, but rather try and delete the file as was saved and try again. If you delete the file in Acrobat, Acrobat will delete the file in the wrong order to the end of the file.