-- make scale factor to 1.0f and 2.0f, it seems ok for me
please run TMXHexTest in iphone4 and iphone5 will show the difference. 
in cocos2dx3.0rc0 the sample seems ok, because sample provided two type tmx resource. tilewidth="64" and tilewidth="32" (*see orthogonal-test4.tmx), but TMXHexTest did not.
normally we do not want to design different map size.