Different amount of pages when generating PDF, or sending to the printer

Hello everyone,

We have an issue, that in my short experience (and my partners'), is quite a strange thing.
We have a report, and the number of copies are introduced in the request page. If we generate the PDF, the number of copie aer right. But instead of that, if we send directly to print, the number of copies is less.
Example:
- No. of copies = 7--> Pages in printer = 3
- No. of copies = 10-->Pages in printer = 4
- No. of copies = 20 --> pages in printer = 7
- ...

I insiste that if we generate a PDF instead of sending to the printer, the number of copies is right.

Any hint about this X File?

Thank you very much