Do you have any urls with query strings? I ran into this a few weeks ago. The report will see each url with a query string as unique and flag each one as missing a meta description if the main url does not have a meta description.
For me, it was just a registration form that had data pre-populated by the query string. I added a meta description to the registration form page, which was also pointed to as the canonical, and 65 errors were fixed.