I'm not sure if why,
On my frontend submission form, when choosing an image, it deletes the actual image being uploaded
The field is a 'Single Image' type, and 'save value' is checked
$field = 'title';
$metabox_id = 'agency-listing';
$form = '[mb_frontend_form ajax="true" post_id="'.$post_id.'" id="'.$metabox_id.'"]
';
echo do_shortcode($form);
?>