A family of Microsoft presentation graphics products that offer tools for creating presentations and adding graphic effects like multimedia objects and special effects with text.
Very odd, indeed.
It looks like the rectangle on the Master printed at the correct size but the rest of the master and slide content got shrunk.
What is the current slide size (in PowerPoint)?
What paper size did you choose in the Print dialog | Printer Properties?
In the print dialog, did you choose Scale To Fit Paper or was that left unchecked?
We don't have PM for sending files but if the file you used for the screenshots has no other information in it, you could post a copy of it on DropBox/OneDrive or the like and reply with the link here.