Card Validator returns success but isn't showing my meta description or image



We are updating our blog to support proper meta data like Open Graph so that links shared render beautifully on Twitter, Slack, etc. Our current setup is supplying a meta description, an Open Graph description, and Open Graph image. Slack, Facebook, and LinkedIn all pull this info in fine in the cards they render but Twitter is not showing our description or image and I can’t figure out why. I’ve burned an hour or two on this already.

This URL has the new meta data in it:

The Twitter card validator responds with:
INFO: Page fetched successfully
INFO: 14 metatags were found
INFO: twitter:card = summary_large_image tag found
INFO: Card loaded successfully

Here is an image showing the lack of description and image:

Can someone please help me determine what we are doing wrong, or if there is some other problem?

Thanks in advance for the help.