Books Invoicing Template; adding contact person name

Books Invoicing Template; adding contact person name

Hi,
I tried to post this earlier however cannot see where it went to. I'm adding Contact names above the Address on Invoices, however having problems with these appearing on the pdf's. The people concerned are loaded in the system as 'contact persons' and their names are ticked on the invoice edit page. When the invoice is saved and the pdf loaded up, the contact person' name only half appears and sometimes displays nothing or %LastName% instead of the value.

Am I doing something wrong here or is there some kind of issue with this method?

Thanks,
Phil