Hi jnlwhln,
Welcome to the HP Forums, I hope you enjoy your experience!
I understand the top and the bottom aren't printing.
I will be happy to help you.
Check the paper size settings from the application and the printer driver.
From the application, go to file, print, paper size is listed and select the proper paper size.
What operating system are you using?
Mac OS X: How Do I Find Which Mac OS X Version Is on My Computer?
Let me know the results.
Thank you for posting on the HP Forums.
Have a great weekend!