On line 20 I changed:
$WAFV_Errors .= WAValidateEL((isset($_POST["Registration_group_5_Last_Name"])?$_POST["Registration_group_5_Last_Name"]:"") . "",6,100,true,7);
to
$WAFV_Errors .= WAValidateEL((isset($_POST["Registration_group_5_Last_Name"])?$_POST["Registration_group_5_Last_Name"]:"") . "",4,100,true,7);
Onward, thank you.