On my Wordpress site which uses the Divi theme, some posts successfully generate a Twitter card, others don’t.
For example, http://news.umary.edu/st-gregorys-university-surprises-monsignor-shea-with-honorary-degree/ does generate a Twitter card.
http://news.umary.edu/bioethics-seminar/ does not. I get the following error from the card validator:
INFO: Page fetched successfully
INFO: 25 metatags were found
INFO: twitter:card = summary_large_image tag found
ERROR: Invalid value (message: Field description failed to validate because: text expects tag property, but not found in Map().)
I can’t figure out why some pages successfully generate the card/description metadata while others don’t. One notable difference I’ve noticed is that http://news.umary.edu/bioethics-seminar/ actually utilizes the Divi Builder whereas the others are just text with images inserted.