Incorrect comment count numbering

I did a little test to see what's going on, and this should be helpful.
I replaced line 243
$linktext = '#' . (($page_number * $post_per_page) + $post_number); with this:
$linktext = 'initial post number: ' . $post_number . ' | #' . (($page_number * $post_per_page) + $post_number) . ' | page number: ' . $page_number . ' | post per page: ' . $post_per_page . ' | post number: ' . $post_number; and here's what I got:

initial post number: 4 | #4 | page number: 0 | post per page: 10 | post number: 4

initial post number: 6 | #6 | page number: 0 | post per page: 10 | post number: 6

Any ideas?

Thanks, Michelle! Thanks for directing me... Once you mentioned pre-processing, I took a look at my template.php file and found that it was indeed calling twice:

function cpj_fresh_preprocess(&$vars, $hook) {
  if (module_exists('advanced_forum')) {
    $vars = advanced_forum_addvars($hook, $vars);
  }
}

After removing the $hook variable from the first line, it works like a charm.