Hello!
I am using a Xerox Color C75 press and every time I try to duplex it gets offset on the back side. I am using CorelDRAW X8 on Windows 10 - 64 bit. I use 13 x 19 gloss paper. Usually use it to print business cards.
-Thanks!
Without having the device it's hard to tell you can try publishing to a native color PDF using press setting and print from Acrobat.