I'm assuming that this script is the "search" page and the "results" page is where you are printing the parameter values (not shown here).

print start_form(-action=>'results.cgi');
end_form; ### THIS CAUSES REDIRECT TO RESULTS WHEN USER HITS SUBMIT

It looks like this might be the issue: You want to print end_form() (not just run it), and you want to do this at the end of your script (ie, at the end of the form), not here.