shivanerd

I have a HP Laserjet Pro 500 MFP in the Headteacher's office that when printing powerpoint handouts in duplex all the even pages print the slides all scrambled, now I don't mean upside down or garbled text, I mean that the text and images in each slide seem to be chopped in half and inverted line by line. If I print to any of the other MFP's it works fine but that is not a long term solution. Has anyone come across this and maybe have a fix?