[PHP] Forms lose data when going back in browser

I have a submission form distributed over 5 pages. When the user hits the back button in the browser on one of the pages to make changes on a previous page, all fields are emptied. This is only when I have a session running. When I use the same pages without the session, the data stays in the

[PHP] Forms lose data when going back in browser

I have a submission form distributed over 5 pages. When the user hits the back button in the browser on one of the pages to make changes on a previous page, all fields are emptied. This is only when I have a session running. When I use the same pages without the session, the data stays in the