Missing the salutation for some orders

I have requirement to insert the salutation and firstname,lastname and all the user data from billing address from font end and storing in the oxorder table. when we order the items for giving the all details and order the items it will store all the user details in oxorder table then now user want see the all orders from backend in Administartors->orders we will find the all orders this time some orders missing salutation
I have used the code to display the salutation:
$sSal = $oLang->translateString($this->oxorder__oxbillsal->value, $this->_iSelectedLang) . ’ ';
This code also I am using in invoice to display the order information but this time also I have same problem some of orders missing salutation
please give any idea to display salutation correctly for all orders