A family of Microsoft word processing software products for creating web, email, and print documents.
Assuming that in both cases, you inserted the return address into the Return address space on the Envelopes tab of the Envelopes and Labels dialog, click on Options on that tab and then go to the Printing Options tab of the Envelope Options dialog and change the Feed method.
If however, at work, you had used the Add to Document facility, and then typed the return address, make sure that you type it into the frame that is provided for it as outlined in red below (It helps to have the display of non-printing characters activated):