Need to know why this notification triggered.

Summary:

One of the employee, received the goals shared by his manager. He then added that goal to his goal plan. After that, he edited that specific goal and checked the 'share this goal with your organization' option to share it to his direct reports.

Surprisingly, this triggered notification to his peers saying that organization goal shared by his manager was published. Does anyone know why? How can we stop this notification.

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