I click on flip manually but the printer still chooses duplex for me.

I'm trying to print in a program (Mastercook 15)  that wants me to manually flip my pages.  I check the box that says flip manually but the printer still chooses duplex printing and prints on both sides.  (I've checked the properties screen and have found the duplex box checked.)  Any ideas how to override the auto duplex printing on the MX922?