Report Help please for invoices

[hullstorage]

I have a report for print invoices
these are printed from a form so i can either print the invoice for a selected customer or print all invoices

the problem is when i print for a selected customer the report is fine
but when i print all, i am getting all records for every customer on one invoice?? any suggestions

think may be problem with force new page or something

these invoices a grouped by customer

thanks
simon