How to redirect users to same form after the form is submitted?

Once a form is submitted, if I hit the back button, all the information is still there.  I thought it was a setting issue, but I can't find any setting that will make it disappear correctly.  We use the forms at our church to sign up for different classes, and using the back button is the easiest way to prepare the form for the next person.  Any suggestions?

Which browser are you using? I made few tests in Google Chrome and Mozilla Firefox. Google Chrome will save previously entered data and data will be shown if you use browser back button. However Mozilla Firefox will not save previously entered data. Form will be cleared if back button is used. 

Instead of using back button, you can redirect your users to the same form. Inside of this guide you can find how to do it: 

Redirecting Users to a Different Page

Where to Find My Form URL?

Here is my demo form: https://form.jotformpro.com/71905815488972 

Feel free to test it. 

Hope this will help. Let us know if you need further assistance.