How to disable New User Email Notification in WP 4.0?

Whenever a new user is created I get a notify email with this format:

Subject: [Site Name] New User Registration

New user registration on your site XXX:

Username: XXXX

E-mail: XXX@XXX.COM

I have already unchecked Registration Notification ("Send the network admin an email notification every time someone registers a site or user account.") in the Network Settings page.

Is there a reason I am still getting this emails?

I have verified the emails get sent:

1) When I add new user as network admin in network admin WP settings.

2) When I create users with Gravity Forms User Registration Add-On.