Welcome to LQ
You need to look at the plethora of text transmogrifying tools in the linux command line. The best way is to type into a terminal
e.g. man lpr
and read the page. The3re's also lp, and gs renders the postscript.
In linux, everything is specified somewhere, and problems like yours occur when you have the wrong value specified. Presuming you're printing with cups, it's
& select printers, your printer, administration, set default options, and twiddle your paper size there.
If you're doing something different, explain how you set up printing.