Email me a pic mate if you can and ill take a look.
Has the grain split right through? or is it just the grains on the face that's lifted? Did you oil it before knocking in? Where has the bat been stored whilst you've been shaping it?
It depends how big the crack is, obviously it wont be as strong. Any chance of a picture?
Probably just one of those things. May not be something you had done during shaping. Could be a pressing crack which wasn't obvious when shaping.