Emailing the guest about a deposit

when i type someones email in the form they get the email as well when i submit it and i dont want that to happen 

This happens since your form has an email auto-responder automatically added as soon as you add an email field, you could delete it by following this guide: https://www.jotform.com/help/132-How-to-Delete-Notifications-Autoresponder 

If you have any question, let us know.