I ended up solving this problem by switching the “Paper Source” to Manual Feed Tray, then creating a custom paper size. Never could make the Top Feed allow for 13x39 and it had to be done in the Professional Print and Layout driver, no other program ...
You have not answered the question. We all know how to set custom sizes. What was asked was "Why does the printer not print the size that we have indicated, when it is not one of the standard sizes?" I have had this problem as well. I select 13x39, s...