Tundra + Lumi, dropdown menu bug when page loads after cache flush?

Hi,

I have noticed an error in my Drupal / Tundra / Lumi build, when you clear Drupal's cache (either by UI or drush) and load the main page and start clicking on any of the menus when the page loads for the first time the main menu loads as fully expended for the first 1-2 seconds, then they disappear until you hover onto them (as expected).

Is there a way to prevent them from expanding on first page load after cache flush?

I assume what is happening is as the page is loading, some components of the menu load first, while others load last that instruct the menu to be shown as collapsed.. consecutive hits to the same menu/page don't have this effect because they are already cached.

The same issue persists in IE, Chrome and FF.

Screenshots attached.

I can provide further debugging if required.