What happened to this 5$ 2004?

I found this 5$ note where the writings on the face of Laurier appear clearly, without the use of a UV light. The gold maple leaves, left to the "5", are also more obvious than usual.

First here are the pictures, comparing the weird bill to a normal one, both 2004:

front:
http://img512.imageshack.us/img512/5372/52004rectosco1.jpg

back:
http://img170.imageshack.us/img170/859/52004versoslu8.jpg

And for the dimensions...
weird one: 148mm X 69mm
normal one: 152mm X 70mm

Nothing so far have convinced me that it could be a fake. I assume this 5$ is smaller because it shrinked after a bath, or a few washes.
Maybe some product (detergent?) revealed the writings, normally invisible without a UV?

I don't know

, and that's why I share my interrogations with you!
You've seen this before?
Do you know of any substance that can make those "invisible" writings clear?

Thanks!