Jaw issues (for my headpiece, not the killer shark!)

[muckypup]

Sorry if this is not the right place, total noob here!

So I'm working on a full suit, working with upholstory foam on a cap as the base.
It's a dinosaur, so the snout is longish. I guess similar to that of a horse?

Anyway, carved the basic shape and happy but it seems the lower jaw has warped. (I couldn't work on it for a few weeks and I 'm thinking it was by the sun)
It now looks like a lizard, billygoat mix. (which is hilarious, but not what I wanted!
I'm going to work on it tonight but thought I'd see if any pro's had advice before I tackle it.
Thanks guys!

[Nori]

Could you possibly upload a picture? Like use imgur and copy the bbc code (forums) link and paste it? A few things come to mind when you saw 'warped' and I'm not sure which one you mean.