When adding an image to a page or post, that image is used as the Featured Image, even though the option is not set.
In some older versions of Coaching Pro, you may run into this issue.
Please update the file: /coaching-pro/lib/theme-setup.php
accordingly:
Update the code starting at Line 220:
Save the updated file and upload it into your theme folder. You will now see the image in the body of your page or post is no longer used as the Featured Image.