Can't seem to get the header height to work

I've gone into the 'header image' tab and changes the height to 250, which is the height of my banner. But the size doesn't seem to change and my banner is getting cut off at the bottom. If you look, you'll see that only two lines of text are showing. There's actually supposed to be four lines of text. Two lines are getting truncated.

Can you help? Here is a link to my site: http://jonathanstein.org/

Thanks!