Featured image not displaying on single post

I recently switched to the Astra theme and I’m having an issue with getting the featured image to display on a single post page. The featured image displays everywhere else fine but not when you click on the single post.

I’ve tried deactivating all the plugins but the image still won’t display. I’ve also tried a default theme and everything works fine with the default.

Please send help.

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