Facebook and Twitter cards display wrong image for posts

This is being done by a plugin, so the question should be in the plugin’s support forum.
But it really is not the plugin’s problem. It is the external website, remembering what you had before. You have to go to that website and their dev tools and tell it to reload (rescan) your page.

Hello @saulphineas!

What images should be displaying in sharing, for these two posts?

And, are you using Jetpack Publicize, Jetpack Share Buttons, or some other service to manage sharing?

When I go to share The Humans have Landed on Facebook using the Share button on the post, it pulls the current Featured Image, which is a variety of dice. That makes sense to me, as the share function should logically pull the Featured Image first if there is one.

The second link doesn’t pull the Featured Image, but instead uses the image with the three race cars (from item #3 in your post) for Facebook share. I noticed that the featured image on this post is a PNG rather than a JPEG. Could it be that Facebook share doesn’t like PNG images?

Also, from what I understand of Facebook sharing, by default they pick whatever image they want from the page or links, and you’re kind of stuck with it. It might be the featured image, and it might not, unless you tell it otherwise. Facebook must have issues with this, because there’s a whole section on their developer site that addresses image optimization for Facebook sharing.

Yoast SEO should let you override the random selection for Facebook sharing specifically – in the Edit Post screen scroll down to the Yoast SEO section, click the “Share” tab on the left, and then upload an image to be used for Facebook sharing. The tooltip states:

If you want to override the image used on Facebook for this post, upload / choose an image or add the URL here. The recommended image size for Facebook is 1200 by 630 pixels.

I hope this helps! Let me know how it goes.

If all else fails, it may be something with the sharing plugin (Jetpack?) or with Yoast SEO, in which case you can click either of the links in this paragraph to get to the plugin-specific support forums.

Interesting. When I first viewed The Humans have Landed post it showed me the dice image on the post, but now I do see the UFOs and it is using that UFO image on the Facebook share as well.

If the site uses caching, I wonder if the image change just took a while to propagate to the point where it was reflected everywhere? The other post, my best guess it is just grabbing the largest original image on the page, so it may be worth slightly downsizing images if they’re going to be used in-text so the featured image takes priority. For example, if your Featured Images are standardized to be 2000 pixels wide (original size), make the in-text images 1500 wide before uploading (or something similar).

I’m not familiar with that plugin, but it may be worth popping in on the dedicated support forum for the plugin if you want to try your luck with a more focused support community.