Mail notifications going to all reporters for new issues Follow

I have a project in Youtrack and several users with Reporter Role. 

These users only have notifications active for starred issues and "assigned to me", "reported by me" and "commented by me". 
Now I have created an unassigned issue and mentions one of the reporters with @ in the commenta. 

It seems that the other reporters also get a mail notification about this issue; "New Issue in Project X".
On the bottom of the mail it reads "You (John) received this message because you had enabled notifications for: Reported by me saved search."

But - John has not reported the issue, I (Sylvia) did. 
Is there something configured wrong or anything else I am missing? Any help is greatly appreciated.