Crossbeak or something else?

once you post a picture you will have an answer, but may be cross beak. How old is your rooster?

 

Crossbeak is usually hereditary, so there isn't much you can do about it. Many cross beaked birds live normal lives, though may need a little extra help. Providing deep dishes of food makes it easier for birds with a cross beak to eat. Sometimes, trimming the beak so that it aligns better is a good idea.

Here are is a good link on living with cross-beaked birds:
https://www.backyardchickens.com/t/...-for-special-needs-chickens-and-their-keepers

And, some other links:

http://ontheurbanfarm.blogspot.com/2012/10/cross-beaksplit-beak-not-hopeless.html
http://www.the-chicken-chick.com/2012/03/scissor-beak-aka-crossed-beak-what-it.html
https://www.backyardchickens.com/t/859202/no-emergency-how-to-trim-a-crossed-beak

I hope this helps!