Formhandler

Not sure if this is a bug or a problem of my setup:

When a user fills out the form and submits it, he sees the success page, where he's shown some info on his registration (e.g. his name). At the same time, an e-mail is sent to both the user and the admin, and the registration is saved in the database. All right so far.

However, when he then goes back using the browser history back function, he is presented with the filled out form from before once more. He can do some changes (e.g. enter a different name), submit the form again, and will see the success page again, with the changed registration info. The problem is, formhandler does not create a new registration for this second submit. It's as if it never happened (no e-mail sent out, no entry in the database). The user never realizes that he can't just go back like this because there's no reload error, and he even sees a correct success page, with the new information he entered.

Any idea what to do about this? This is a problem for me because I use formhandler for a registration form, and sometimes users will want to submit registrations for several people (e.g. one person registers all the participants from his company).