why permission is auto changed?

why permission is auto changed?

We are using Netflow Analyzer EE  7.7.0 .
Recently a question of the right permissions.
System running for some time, or add some monitoring equipment group, all accounts will be able to view all devices, even without the authorized equipment.
I went to check the account authorized account authorization has been automatically changed to can view all devices, but I have not done any changes on the account. Why is that?

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