Please note that a Featured Image is REQUIRED on all posts. If you submit a post that does not have a featured image a default picture will be used but your post may be returned to draft with a note requesting you to add a featured image that is relevant to your post.
Are your post being sent back to draft? If they are it is because the editor wants you to fix something. To see the note from the editor CLICK HERE where you can find all of your posts. Click on the post that has been sent back to draft and you’ll see a note from an editor with instructions on what needs to be fixed before it can be published.