When creating these pages, did you copy and paste the sort code from one page and add it to all of them?
the sort clause is stored in a session. by default, the session variables name will be:
in all of your pages, the session is being named:
this suggests that you initially added the sort behavior to a page named ExploreLakeAnna_Results.php, then copied the code and added it to each of the other pages.
On each page, edit the sort server behavior, in the session variable section, change the session name to something unique for each page.