ahh I understand now, this has been fixed for next release.
For now, you can edit sources/join.php and remove these lines:
$TMPL['description'] = preg_replace('/[^A-Za-z0-9 .,\-]/', '', $TMPL['description']);
$TMPL['title'] = preg_replace('/[^A-Za-z0-9 .,\-]/', '', $TMPL['title']);