The picture on the theme page shows a sidebar.
I have uploaded the theme to my side and there is no sidebar. I came back to look at your "preview" and there is no sidebar there, either.
Looking at the code, there appears to be a </div> missing in header.php.
I don't know php; I only know html so I would appreciate your verifying to me that a div is missing. I think it is the last div that should close the opening header div so that when header.php is called into index.php, only the wrapper div is yet to be closed.
Thanks.