Twitter Cards Not Displaying Correctly

I’m sure there’s a simple fix for this, but I’m not very WordPress-saavy and I haven’t been able to figure it out.

Whenever I try sharing a blog post from my website, the Twitter card will not display the large feature image correctly. Instead, it just displays the grey box with the link.

We have the Yoast SEO plugin installed and I’ve tried going under SEO > Social to ensure both Facebook and Twitter meta data cards are enabled and they both are, so I’m not sure what else to do to resolve the issue.

Any help or insight help would be greatly appreciated!

The page I need help with: [log in to see the link]