This had driven me nuts for ages - and I Googled a simple solution.

"Sure enough, in the print options menu-- Emulate LaserJet Margins and Symmetrical Margins.
I checked Symmetrical Margins and all is well. Thanks Wizard-fred."

I checked Emulate LaserJet - and now I have BOTTOM BORDERS!

Thought it might help others here and save some paper ripping and headaches.