Document borders and shading for Dummies (like me)

I can do complex tasks, but the simpler ones trip me up.
I am trying to make some award certificates, and I want to create a full border (top, bottom, left, right) for each one. So I do it, and it shows up fine in the print preview, but when I print out a test copy, the entire rightside border is missing. What do I need to change here? the margins or something else?

Could be margins…did you create a table? If so, double check that you haven’t accidentally set it to only show three sides of the border. I’d check the margins first though.

I never created a table. I did take a look at the settings for the margins but I must not have tweaked it right.