Cal here from Shopify, thanks for reaching out to us. That is expected behavior on most themes, and that white space gives the product photography room to breathe and stand out on its own. The right column then is for product description and all the noisy details.
Was there something you were looking to place in that white space? What were your thoughts on it?
Hmm you could look to do that, but I'd be wary 'wrapping' your product images with walls of text. Instead, you could look to add something like product reviews under there in the white space? At least that wouldn't be as text heavy? Do you have Product Reviews on your store? You could request this from our support team if you are eligible for design time.