I just recently purchased an Epson WorkForce printer. It support two sided printing. However, when I use this feature it prints one side one way and the other side upside down. This does not happen when I am printing a word document. When I contacted Epson, they told me my problem was a setting in the Adobe Reader. Has anyone else had this issue?
Try turning off auto-rotate
Did you make sure you selected the correct binding side (long edge or short edge) in the dialog box once you selected turn on double-sided printing? This would cause the problem you are describing.