I think I would call that a nuisance at best and an error on our part at worse. I will certainly open a ticket to discuss removing it under these circumstances.

Pending that I would suggest you open up the spFunctions.php file in your SP theme and add the following code:

add_filter('sph_ProfileUserFeedkey', 'hide_feedkey');
function hide_feedkey() {
    return '';
}

That will remove it from the profile display