duplicate notification - Email Notifications for Google Forms

My subs are for 2 users but we have problems with duplicated notifications.

User 1 does "Stop sending form notifications from your current email address" but it is still duplicated and sometimes triple notification,

 
 After clicking Disable or restart button I didn't get an onscreen message confirming that the notifications have been turned off for that Google Form.
 
I Appreciate for your help.
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