What could be causing the form not to submit properly in the PHP setup script?

The issue of the form not submitting properly in the PHP setup script could be due to errors in the form action attribute or the form submission handling code. To solve this issue, ensure that the form action attribute points to the correct PHP script that handles the form submission. Additionally, check the PHP script for any errors in processing the form data and make necessary corrections.

<form action="submit.php" method="post">
    <!-- form fields here -->
    <input type="submit" value="Submit">
</form>
```

In the submit.php file:

```php
<?php
if ($_SERVER["REQUEST_METHOD"] == "POST") {
    // process form data here
    // example: $name = $_POST['name'];
    // example: $email = $_POST['email'];

    // redirect after form submission
    header("Location: success.php");
    exit();
}
?>