It's just the way it grew when he was in velvet so it's hard to say exactly what happened unless you saw it. Chances are it will be normal when he grows his next set.
Had one like that a couple years ago. Grew straight out the side of his head. We called him Bullwinkle. Only got to hunt that farm 1 year, so don't know what happened to him. I believe it is a damaged pedicle, and will probably always grow that way. Here's a pic of him.