Social Marketing Ads Not Showing on Blog Index

What might keep the Social Marketing shortcode from rendering ads on the index/home page of a blog when they display fine on the Single post page? See links below for example...

Here the ad displays fine:

But no ad shows in that same post here:

Am I missing a setting somewhere? I don't think it is theme related because it's also happening here...

See ad in this post:

See no ad in second post

Anyone else experiencing this behavior? I'm hoping the awesome support staff here can try to replicate this issue and help provide a fix. Thanks!