It sounds like the product description is disabled. To make sure those descriptions are appearing on your product pages you’ll first visit your theme editor. You can then enable them by going to Select Product Page > Find Product summary. Make sure the Description block (as shown in below the screenshot) is added and enabled. If the description block is missing you can be added using Add block menu.
Otherwise, without being able to see your store, it’s difficult for me to establish what is happening. Would you mind sharing your website URL with me so I can take a closer look?
As you continue to customize and further develop your store, have you looked at ways you can also optimize your product page for increased sales? We have a fantastic blog post here that provides some top tips! Your brand is important everywhere, from social media images to your post-sale emails, but it’s especially important on your product pages.