Zoho books: Invoice template contact name

Zoho books: Invoice template contact name

Hi,

Am trying to set up an invoice template, which has an address to a particular employee of a company - on request of client.
 
I'm getting a bug when using %Salutation% %FirstName% and %LastName% above the customer's address, on some invoices the values refer to the default contact person and on others the field is left as its name, ie. %LastName%

Am I doing something wrong here? Or is there an easier way of doing this?

Many thanks for looking into this,

Phil