By default, your Google calendar is set to automatically add invitations to your calendar whether you respond and accept/reject the invitation. To change this setting, once logged into your Google account:
Click the apps menu in the upper right corner and select Calendar
Click the gear icon and select Settings
Click General in the upper left corner and scroll to the section that reads "Automatically add invitations to my calendar". To turn this off you will choose the options that reads, "No, Only show invitations to which I have responded. Click Save.
Refer link for more details or check below screenshot.
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