unable to display all blog posts

when any user clicks on page 3 or above of our blog section we get a 404 error. see(http://greenewit.com/blog/1/listings/categories/10/page-3) Pages 1 and 2 display fine. I have checked the back end and all of the settings are set up the way we had it before and i can also see all of our older blog entries in the backend and they are all published but not all showing up in the front end.

Please see the screen shots of the error message.