For some reason, the free shipping image is not appearing on product pages that are set to have "always free shipping"

I've confirmed that I have an "always-free-shipping.gif" file saved to my own template directory under /images. (the default_template/images directory also has an always-free-shipping.gif file)
A product that should display this image is:
http://spritelygoods.com/zencartv151...&products_id=6

I have not customized or changed the tpl_product_info_display.php file.

Shop is being rebuilt onto v1.5.1 using my existing database from my 1.3.0.2 shop

Thanks in advance for your assistance!