Or, try printing a demo page and see if it does it there
Or, Select LaserJet4 Plus driver and see if that helps.
Or, try setting lines to 60 and nothing more. It’s a page printer, if there are 64 lines or more, it will put things on a second (blank) page.
Also, try turning of “Bi-directional Printing” in the printer properties.
If not, the printer just may be busted.