how many invoices are you printing at once?
Fliop through eachof the pages and make sure that each invoice is gettng the corerct ABC value for that page.
did you supress the report header and footer to make sure that they do not make your first and last pages longer than the page size?
do you have any detail sections or group headers and footers that are unsuppressed?
just do a flat suppression of each of the A B and C footers. then one at a time unsupress them (no conditions) and resupres the prior one (only have one show at a time) and see if any of these 'break' your report regardless of suppression.