You use Adobe Reader and a printer with the universal Xerox Global Print Driver, and want to print e.g. 2 copies of a one-page document – but you get 4 copies.
Reset your Xerox and Adobe Reader settings, i.e. run regedit and delete the following entries: HKEY_Current_UserSoftwareXerox and HKEY_Current_UserSoftwareAdobeAcrobat Reader.
I also recommend to delete and re-install the printer.
Reboot your PC.
Print a PDF. When the dialog “Potential Printing Problems” appears, choose the last setting (“no changes”). Now it should work.