Colleague is receiving email notifications for someone else's @mentions

I tagged one person in a comment, but someone else received an email notification that she had been mentioned. Her name was never in the comment. She is a collaborator on that particular task but was not mentioned in the comment. This happened twice today on separate projects. Any ideas why this might happen or how to fix it? Thanks!

3 posts were merged into an existing topic: Email Notifications for tasks not assigned to the user now have “Mentioned you:”