[Plugin: Pinterest Pin It Button For Images] Button only shows up on first of many images

Using the “Grey” theme, the pin it button only appears on the first of all images in the post.

This happens both on the “single post” option and the “Selected images only” option.

Grey theme: https://webexpedition18.com/work/grey-a-new-free-html5css3-wordpress-theme/

https://www.ads-software.com/extend/plugins/pinterest-pin-it-button-for-images/