Hi,
From what I can see on your website I would say that you have a translation override of the translation key X_ITEM_FOR_X with an empty value on your website, while you don't have one for X_ITEMS_FOR_X
And thus, the "1 item for $xx.xx" text is not there. But the HTML around it ( the link, the popup displayed when you click on the link, etc) is there on the page. So you think the module is not displaying, but it is. It's just that there is no text to display along with the rest, and thus it looks like nothing happened.