Combine PDFs that are images (non-OCR'ed) zooms output

Issue:  Users are scanning single pages to JPG.  They then print each page to  PDFCreator creating several files.  Then they either drag all files into PDFCreator or click on the + to add files, do a Combine All, then print to one PDF file.  Some files are displaying as if they are zoomed in 400%. 

Workaround:  I had them open each converted JPG file as PDF, and print it to the PDFCreator print driver and hit WAIT COLLECT on each item.  Once all in the queue, they can combine all, print the one PDF to file and it looks just fine.

Why is it zooming and cropping the output if the Image PDF files are drag-n-dropped in to the app or are added via the + icon or the menu Add option?