I can confirm that I am experiencing the same behaviour.
Here’s a screenshot of my settings for the widget instance:
Screenshot
Here’s a link to the ‘Health’ category archive (the Health4Men Q&A widget in the right sidebar is the one I need displaying on the post pages for posts in the ‘Health’ category:
Archive Page
And here’s a link to the post page for an article in the ‘Health’ category, not showing the widget:
Post Page
As the issue is identical to that of the earlier poster, and as this thread has not been locked, I hoped that posting evidence here might enable you to assist both myself and the original poster.
Thank you!