Tweak Me v2 - How to Stop the Featured Image from Showing Up Twice

By default, the featured image is automatically added before the content of your blog post. This can cause problems if you choose to manually enter the featured image into the post content. The image will show up twice.

To stop this, go to Appearance > Theme Settings, click the "Layouts" tab, and click on the "Single Post" link.

The first option is the "Post Information" section. Simply find the "Featured Image" box and uncheck it. This will stop it from getting auto added to your blog post, but it will still show up as a thumbnail on the blog archive (if you have the archive display set to "excerpts").