Check the original file for:
/includes/templates/template_default/templates/tpl_modules_product_listing.php

and check your templates and overrides file for:
/includes/templates/your_template_dir/templates/tpl_modules_product_listing.php

and compare to a clean Zen Cart v1.3.9h for this file ...

You should see code similar to:
Code:
<?php if ( ($listing_split->number_of_rows > 0) && ( (PREV_NEXT_BAR_LOCATION == '1') || (PREV_NEXT_BAR_LOCATION == '3') ) ) {
?>
<div id="productsListingTopNumber" class="navSplitPagesResult back"><?php echo $listing_split->display_count(TEXT_DISPLAY_NUMBER_OF_PRODUCTS); ?></div>
<div id="productsListingListingTopLinks" class="navSplitPagesLinks forward"><?php echo TEXT_RESULT_PAGE . ' ' . $listing_split->display_links(MAX_DISPLAY_PAGE_LINKS, zen_get_all_get_params(array('page', 'info', 'x', 'y', 'main_page'))); ?></div>
<br class="clearBoth" />
<?php
}
?>