If you have 2 logos on your site it means that you copied header.php file from the previous parent theme version to the child theme. Edit the child theme header.php file, compare it with the existing parent theme header.php, and add the necessary changes that we did in the latest version.
Let us know if this solve the problem with the sticky header too
One standard license is valid only for 1 project. Running multiple projects on a single license is a copyright violation.