That's strange, I just tried it out and it didn't happen for me in iPad view. I appreciate the link for the site though, was great to check out!
Well that is strange ... looked again in iPad (all) view and they are definitely touching (just).
It may be a freak combination of that view and my 15.4" laptop screen.
I wouldn't fuss about it. Would be interesting to look at your site on an actual iPad (which I don't have!)