When somebody else posted something that sounded similar, PatriceJ posted the following, see if it helps you:
"when there are many, many pages of anything, the navigation bar will show only so many specific page numbers at one time. the range of page numbers displayed changes as you make your way through the pages. you can skip around by using the "Page # of #" drop-down list. Just type in the page number you want to skip to. lots of web sites work that way."