Returns same image regardless of rules

Firstly, we wanted to say how great your plugin is, thanks for all of the efforts on it.

Our use case is that we would like to have a different featured image for each category. We’re having an issue where the same featured image shows regardless of category.

Here’s the settings we’re using:

1. Unchecked “Activate to automatically overwrite an existing featured image while saving a post”
2. Unchecked “Activate to automatically use the first content image if available in the media library as featured image while saving a post”. Checked “posts” under post type
3. Then we have a list of “category” and relevant category rules.

We are not using custom post types, but we are using a custom post single page layout that we built in Cornerstone / Pro (Xtheme). We’re running the most recent versions of all plugins, WordPress and Pro.

Any idea what we might be doing wrong here?

Thanks in advance for your help!