[NSFW] Badge Not Showing

I’ve just installed this plug in so that out of stock products will be easily visibile from the search page but the badge is not showing. As an example, all of the Cherry Bomb products are currently out of stock.

It seems like the badge is only applying to the first out of stock product on a page. Please advise.

Thank you!

The page I need help with: [log in to see the link]