Default User Emails Still Sending

I’ve set up a simple contact form and set a ‘user email’ to send to the email address they included in the form.

However, on testing, the user receives not only this email, but another which is seemingly a ninja default email. It’s listed as from WordPress and sent using the admin email on the wordpress site. It’s subject is my ninja forms name and the content simply says. ‘thank you for filling out this form’.

Would you know why it’s sending that second email / how to stop it?

https://www.ads-software.com/plugins/ninja-forms/