Originally Posted by
sethb
The last boarding pass I printed at home was shrunk, and the app I used couldn't read the "bar" code. When I got one printed at the airport, the app read it fine so I knew I would get PRE.
(Boarding passes used to be about the full width of the paper, now they're a few inches shorter.)
If you use Firefox, go to File->Print Preview and check the Scale: setting at the top of the screen. Another user of the computer could have set the Scale to something small like 50 % which is remembered for future print requests such as your shrunken BP.