New to WordPress. I have been uploading jpg files to the media library for use on web page. One of the jpgs "disappeared" from the page. I went to reinstall and could not. Have discovered that when I uploaded the picture again, when I view it it has a post attached. I have added different photos, recreated the photo, etc, but each time I add a new jpg photo to the media library it has the post box attached to it. None of the other jpgs I have uploaded have this, but now every one I add has it. Can you tell me what is causing this?