Sharing to twitter does not show Featured Image

Hello!

First of all, thanks for your effort on creating this plugin.

Something seems to go wrong on my end. I can not get the Featured Image to show on twitter.

– The validator shows no error.
– twitter:image:src shows the correct image.
– Card is validated.

I do have All In One SEO installed. But the same issue is there when I disable this plugin.

What could be the case?

My site: http://www.sanderbaks.com

https://wordpress.org/plugins/hupso-share-buttons-for-twitter-facebook-google/