In general it is very important to read the subject lines of notifications to make sure it makes sense. Also make sure the below fields are correct.
Admin Notification
Send To Email
CHANGE {admin_email} TO {website_admin_email}
From Email
CHANGE {admin_email} TO {website_from_email}
Reply To
Empty of content TO {Email:2} (If have email in form)
Sender’s Notification
Send To Field
Change empty content to Drop down option for Email
Send To Email
CHANGE {admin_email} TO {website_admin_email}
Reply To
Empty of content TO {Email:2} (If have email in form)