We have offline donation forms that can be printed out from a TeamRaiser and can be mailed into us. There is a code at the bottom, 9999999999, that is being marked out when they print the form. The form displays the numbers on their screen, but not when they print.
This is an issue with the donor's computer and/or printer. If the donor can open the PDF and see all 9s, then LO is displaying the numbers correctly. It is in the printing process that the 9s are blacked out. This is between their PDF viewer and their printer.