Featured images are not showing up on blog posts and when shared.

My website is http://garylott.lifesbeatenpath.com/

In the past few months I've had some support help - which was great by the way - and the problems were fixed. I had issues with author boxes and social sharing icons showing up all over the page instead of just after a post. Those were here:



Now, the featured image does not show up on the blog post. Even though I've set a featured image and you can see it there, it does not show up on the post. Also, when sharing to social media the featured image does not show up. I have Yoast SEO which enables you to set your own featured image and description and even those don't show up.

Help... again!

Thank you
Billie Hiser