PDF Prints Multiple Copies of Same Page

I have a 3 page PDF document. When I try to print it (either single or double-sided), the first page prints on the front AND on the back. Page two and three do the same. I have Acrobat Pro 9.5.5 running on an iMac under Mac OSX 10.8.5.

All worked okay all this time (for many years). The only change was the addition of a Lexmark C2425dw printer (the same thing happens on this printer too).

I have checked the properties of the document and the settings of the printers (they all look correct). I make sure I only print one copy (in the print window).

I have updated the Firmware (to the latest) for both printers as well as updating the latest Drivers for Mac OSX 10.8.

I have printed an email message that is two pages and it prints as it should (page one on the front and page two on the back page - without any extra copies).

Any idea(s)