Hi @wootimes
The problem is that you are not supposed to add field groups using both PHP code and the backend editor as it can cause conflict on your site. That’s why there’s Local JSON feature.
The correct way of using the PHP code generation feature is to generate the PHP code first, copy it to your functions.php and then delete the field group from the backend.
If later you need to modify the field group, you can always modify the PHP code instead. You can also export the field group to JSON before deleting it, and then import the field group back when you need to edit it. Then you can repeat the code generation process like before.
I hope this makes sense 🙂
