Featured Images On Blog Post

Hi there Richie,
I used to have the featured image displayed at the top of each of my blog posts and now they don’t show up anymore. They are still displayed on the homepage but do not show up once you click on the specific posts.

I’m not sure if it’s because of a new update for the theme or for WordPress. Please help, thanks! My site is: https://www.ohjulieho.com

Julie