Mathematica has a strange behavior with respect to printing and saving to PDF. It remembers the print settings, such as page range and number of copies along with the file. So if I print 50 copies of a file for a large class, and six months later open the file to print a copy for myself, the default is 50 copies. If instead I export the file as PDF, the PDF file will contain 50 copies of the content of notebook. I have been using software since 1974. I have worked extensively with dozens of software packages, word processors, spreadsheets, program editors, software development environments, and computer algebra systems. In my experience, Mathematica is the only software package with this frustrating behavior. Is there a setting or edit of initialization files that will cause Mathematica to default to all pages and 1 copy each time a notebook is opened?
A wide variety of print settings can be stored within a given notebook. If you are observing print settings that appear to differ from the default settings then my guess is that inadvertently some unwanted settings have been localized to the notebook. You can check this via the Options Inspector. For your specific problem you can ensure that the notebook will print only one copy by setting the
PrintingCopies option for that notebook. You can do this via the Options Inspector:
SetOptions[EvaluationNotebook, PrintingCopies -> 1]
I just noticed that
PrintingCopies -> 1 is stored in my FrontEnd init.m file so it may also be worth you checking that and modifying the setting if it exists, or deleting it altogether.