This is a Firefox problem. In Firefox, go to File / Page Setup / Format & Options and make sure that the Scale is set to 100%. If that doesn't work, try printing your label from Internet Explorer.
... View more
My labels all of a sudden started printing smaller too, they did that a couple years ago, then straightened out. I will try changing the print setup in another other program idea. Thanks!
... View more
I have had the same problem, but USPS says they can still ship the package. If they can't scan it, they can enter the number manually and that number is clear, though small.
... View more