Are those tags on ‘http://www.mywebaddress.com’?
Bear in mind the linter will follow the og:url tag as this tag should point to the canonical URL of the piece of content – so if you have a page, e.g. ‘http://mywebaddress.com/article1’ with an og:url tag pointing to ‘http://mywebaddress.com’, Facebook will go there and read the tags there also.
Failing that, the most common reason i’ve seen for seemingly correct tags not being detected by the linter is user-agent detection returning different content to Facebook’s crawler than the content you’re seeing when you manually check