Printing envelopes issues

[Max11mum]

on an cannon mixify mb2320 printer i have someone that is printing envelopes out of a word document.  Everytime they try to print it will print an envelope and the letter both.  I tried to reinstall the printer and drivers.  I have also created a word document and and then printed a envelope from this word document and the same thing happens.  What setting am i missing to get this to stop.  Happening to two users of the same printer and different word documents.

Windows10 Desktop pc

Thank you

[Max11mum · Accepted solution]

after some messing around with the printer preferences i was able to change the print options to not print on both sides for everything but duplex.  Had an issue with it taking the change at first but after some persistance the change stayed in place and envelopes printed like normal.  The only setting i left for two sided was the duplex mode.  Thanks