I know this issue is still open on github ( https://github.com/foundation/foundation-sites/issues/11098)
But I would like to know if someone has found a workaround?
When does it happen :
Refresh your web page and scroll down during the refresh.
The top Bar that should be sticky to the body is displayed at the bottom:
Here is my div declaration ( juste like in the foundation example )
<div id="menu" data-sticky data-margin-top="0" data-container-class="sticky_container">
I use foundation 6.5