Hi,
Yes, the items have stock we can see that on the product detail page.
But the stock should be displayed on all the listings too, because we don't have options by default to hide it or not.
If the product has a quantity superior to 0, so it display the quantity. Please check that the file "product / quantity" don't have any override. If it don't have override, please give us backend access to your website in order to see why it's not working as expected. You can send the access via private message, or via our contact form, don't forget to give the url to that topic in the message.