Can you pls vary the value of offset in the file js/main.js line number 79 and check if the problem goes away. You will need to put in a higher negative number than the -100 that we have here (say -200, -300). Since the header is a little bigger than normal, the sticky state is reached sooner even while the header is visible and hence blocking the view. –
$('#header').waypoint('sticky', {
stuckClass: 'sticky',
offset: -100,
If this does not resolve the issue, Pls reply as a private message here with the site URL and I can take a look. You may also email me the same (see bottom right box in my profile page). Thanks