wordpress.com – WordPress Sumo Plugin does not display all images when you click on the pinterest icon

I use the SUMOMME WordPress plugin for social sharing on WordPress Site.
This is the website: https://www.teachworkoutlove.com/

I face under issue in sharing posts with pinterest.

The plugin generally works like I would click on pinterest. The plugin Sumome recognizes all images in a post and displays them in a popup window. Then we have to select the image to be split.

BUT FOR SOME POSTS, PINTEREST DOES NOT RECOGNIZE ALL PICTURES
See for example: https://www.teachworkoutlove.com/7-great-gifts-for-your-groom-after-marriage/

There are almost 6 images in a post content, but when I click on pinterest, only a few images are displayed in a popup that offer a choice to share the images for pinterest.

I checked the console, but there is no error.

Is there a setting I miss on certain posts?

Can someone help me, why is that?

Note: This is a plugin, so I can not release code for how the plugin works. So do not comment on "SHARE YOUR CODE". Hope developers will understand.