So, what happens when you install a fresh copy of Dawn from the theme store? Does it still show zero price on collection page?
You need to have a look at your snippets/card-product.liquid and check whether it has been modified.
Check https://help.shopify.com/en/manual/online-store/themes/theme-structure/extend/edit-theme-code#roll-back – if there is “Recent changes” and “Current” shown above the code editor for this file it means that it was modified. You can try reverting to older versions of this file to see if it fixes your problem.