Shortcodes not running on Front Page?

So, under other themes, I had a custom [previous_years_post_list] shortcode I used on the front page, under the list of the ten most recent posts.

For some reason, the shortcode is not running on the Front Page template when I use the Hey theme. I can’t quite figure out why. Actually, I can’t get it to work on the posts/archive page either.

Other custom shortcodes are working in other templates just fine. But I can’t seem to get this one shortcode to generate output despite it working “out of the box” under other themes.

Stumped.

The page I need help with: [log in to see the link]