Popover darkbackground not working.

Hi,
I am using popover plugin to display gravityform. It works fine but for darkbackground is not working. For "external load" in popover loaded using settings it works but for "page footer".

I tried with deactivating all plugin but still same issue.

I found one problem by using inspection that node for popover is creating twice. Means two node for popover generated. If i delete the second node the issue gone.

Can you help me to find the where the second node is generated from and how to solve it?

please check the issue here:
http://aboutpubliseek.staging.wpengine.com/test-page/

Also check the attached screenshoot.

Thanks