It is important to always keep the header and navigation item data types in sync. Before initial deployment, we recommend creating or editing your header and navigation item in the development version and then copy those data types to your live site. After initial deployment, we recommend to not copy the header or navigation item data types from one version to the other. Instead, you should make any header or navigation related updates directly in your live site via the admin portal.
Whether it is the live or development version, you should add and update these data types from the same version to avoid content conflicts with your headers and navigation items.