ACf does not automatically delete images from the media library when they they are removed from images fields.
I have no idea how you would do this with the plugin you are using.
Just looking at ACF what you would do is create an acf/save_post action with a priority <10. In the action you use get_field() to get the current value of the field. The new value of the field will be in $_POST[‘acf’][$field_key]. The you would compare these 2 values. If the post ID for the old image is not present in new submission then you would use WP function to delete the attachment from media.
