When you printed, did you use a personalized button which perform a script, or only the standard FileMaker Print command ?
If there was a script, was the [Perform without dialog] box checked in the related Print script action / step ?
Did you consider that FileMaker always store print options, even it is no relevant ? For instance :
If you printed one time 7 copies of the second page of your doc (see screenshot), these parameters will be restored the next time you will print, even your actual document have only one page. Result : None .
So, it may be better to always show the print dialog and for the user to always validate this dialog with care.
I hope it cans help you.