Double sided printing issues MFCL5900DW

Just bought brand new printer for the office. We use double sided printing on pre printed invoice paper. The issue is when printing more than 2 pages double sided the printer flips the pre printed sheet over and prints the first page on the blank side. When its just one double sided print out it does its job perfectly!

It is doing this on all 4 computers the printer is installed on. I have tried reinstalling drivers and printer, switching trays, playing with settings in both the printer...

Double sided printing issues MFCL5900DW