macOS Sierra became official not too long ago. If you were part of the Apple Public Beta Program, you‘ve been using Sierra for a while now.
If you did participate in the beta and upgraded your Mac to the officially released version, you will still get betas of macOS updates in the App Store. Maybe you’re happy with the official golden master version, and you no longer want to get the betas. If this is the case, you need to unenroll your device from the Beta Software Program.
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