If it's made from wood it may be naturally bent. It doesn't, however, take away from it's purpose. Some say straight is best. I personally don't mind a little bit of crook or bending in mine.
I like the bends, It makes it look more like it was made out of a real branch. The wand is lovely and I'm watching it, but forgive me for saying it looks like a giant Twizzler! ;)