Hello,
We appreciate you bringing this issue to our attention. We will ensure that it is fixed in the import process going forward.
In the meantime, we recommend that you delete the Newsletter element from the Header Builder content. You can access the Header Builder by navigating to your WordPress dashboard, and once you are in, you should be able to find the Header Builder in the theme settings.
Please let us know if you have any further questions or concerns.
Best Regards,
8Themes Team