Header Image not right Dimensions on iPad and iPhone

I searched your forum about headers not resizing on iPad and iPhone and uploaded the header in Asteroid Options and removed the header image in the Custom Header Section. It looks fine on my MacBook. On iPhone and iPad the header is no longer too wide, but the header height is too short. A white strip shows beneath the header on iPad and is even bigger on iPhone.

I used this method on another website I have done at http://www.iagoblowingrock.com that uses the Frontier theme and it looks perfect on iPhone and iPad.

I’m stumped.