try changing line 15:
$WAFV_Errors .= WAValidateLE((isset($_POST["fieldset_group_nbsp"])?$_POST["fieldset_group_nbsp"]:"") . "",((isset($_SESSION["random_answer"]))?strtolower($_SESSION["random_answer"]):"") . "",true,5);
to:
$WAFV_Errors .= WAValidateLE((isset($_POST["fieldset_group_nbsp"])?strtolower($_POST["fieldset_group_nbsp"]):"") . "",((isset($_SESSION["random_answer"]))?strtolower($_SESSION["random_answer"]):"") . "",true,5);