Hi Tom,
I am currently developping a site and I noticed that the sticky navigation causes the body content to slide downward when it appears. It behaves as expected when I delete the next nav element:
<nav id=”sticky-placeholder” class=”main-navigation is_stuck navigation-stick navigation-clone” style=”visibility: hidden; float: right; display: block; width: auto !important;width:auto !important”>
The site is not live right now, but I can make you an account to check this if you like.
Regards,
Raymond van Melzen