From BioStar 2 v2.7.3, the way new settings are applied is changed when adding administrators using batch edit of devices.
To find more information about the batch edit from BioStar 2, please refer a below article.
[BioStar 2] User Batch Edit
1. Regardless of the version of device firmware, it will be stored in append mode.
2. If there is an administrator in a new device and you add a new administrator by batch edit from device tab, it will be stored 'original administrator + new administrator added by batch'.
3. If there is an administrator in a new device and you edit an administrator who is already saved by batch edit to another operator level, the administrator will be stored with a changed operator level.
4. If the maximum administrator went over after you add new administrators by batch edit, there will be no error message and exceeded administrators will not be stored.
5. After the batch edit was operated in append mode, you will no longer be able to delete administrators by batch edit.