Print pdf with cups over German Fanfold paper (8.5x12)

im trying to print a pdf using libreoffice headless command. The printer is connected direct to the server (Ubuntu 18), and i can print 1 page without problem, but the documents larger than that, the printer leave large white spaces between the pages. The paper size destination is German Fanfold 8.5x12.

Is there any body that faced this issue?

Thanks in advance.
Martin