Widget not showing up at all

I installed the widget and selected one category. It’s supposed to appear in the post page, but the sidebar isn’t showing the category posts, only the title of the widget…I don’t know what’s happening.

This is my website: https://kikidesign.net/dev/jacob/ and this is where the category posts are supposed to show up in the sidebar under “Featured”: https://kikidesign.net/dev/jacob/tv/bartelson-3dc-game-day-umass-know-the-foe/.