My CF7 always send an email to the website admin, why?

Hello,

I have a contact form 7 form which works fine, it is configured to send an email to the visitor, another one to the webmaster and it does it. But it send mistakenly a copy of this latter to the wordpress admin user. In my case, I have two admin users, it sends it to the first one.

It was not me who developed the website and I am wondering how this could happen in order to stop it? Is there any config which tells the contact form to send a copy to the website admin?

Do you have any idea which could help me?