FixedHeader plugin not removing original header

Hi,

I'm having trouble with the FixedHeader plugin. On initial page load, the 2 headers overlap: https://cloudup.com/cYLj0FySCIL
It goes away as soon as I scroll on the page.

Tried grabbing the original header instance, and hiding it after FixedHeader has been initialized, but doesn't work.

Is there any fix available for this ?

Thanks