@nicola1 if you’d like us to fix the overlap we can do this for you if we can possible get an item number where we can see this on your account.
Proforma invoices are really nothing more than quotes/estimates in accounting terms. They are used to advise a client on how much a particular product or service will cost.
Some people call them Proformas, some people quotes or estimates, either way whatever you call it, this needs to go in the invoice customisation section under the name header.