Perhaps you're setting the cookie each time the script is called? Why not check? Say you have a CGI object called $query. Where you set the cookie, add a test for existence:

unless (cookie('sessionID')) {
  my $cookie = $query->cookie(-name=>'sessionID',
                              -value=>'xyzzy',
                              -expires=>'+1h',
                              -path=>'/');
  print $query->header(-cookie=>$cookie);
}
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That's where I'll bet my dollar :)

cLive ;-)