We have a web site under Drupal with a module who generate the meta for the twitter cards.
But it seem that on some pages the card don’t display the image (http://www.ictsd.org/bridges-news/bridges/news/global-steel-crisis-overshadows-us-china-annual-meet):
And on other pages it work (http://www.ictsd.org/bridges-news/bridges/news/un-climate-talks-in-bonn-push-forward-on-paris-pact)
At first, I thought it was due to the twitter cache so I wait for 7 days but the card stay the same.
- to add a random number after the image as said here: https://dev.twitter.com/cards/troubleshooting#refreshing_images.
- to trim quotes in the description,
- to use short descriptions or title (20 characters).
But the card don’t display the image.
The robots.txt seem ok because some page work.
The images used are in the same folder and both are available.
If you have any idea why the image is not shown that will be great.