<blockquote>Responsive layout 600×800 is not correct. As you can see also in your demo, the menu button hides part of the logo. Also part of the text in the slideshow is hidden,
In 768×1024 (tablet portrait) top menu is on the left instead that on the roght so, if you enlarge the logo a bit, the menu hides it</blockquote>
Nope, I have checked in both screen resolution, but I’m not seeing any error as you mention.
Can you show me some screenshots on the issue please?
If the screen is small enough, menu will turn into a button, locate in the left beside the logo.