It is default browser functionality ,you can change the setting using PHP only. You can use these syntax in your PHP config file before the session start:
<?php
session_cache_limiter ('private, must-revalidate');
$cache_limiter = session_cache_limiter();
session_cache_expire(60); // in minutes
?>
Now it will be not ask to re-submission the form.
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solved Back to the form with back button