Customer Details (cust_id, email, and note) empty on Hosted Paypage with preload

Hi,

I'm trying to implement the Hosted Paypage with preoload solution. So far, I'm getting everything working except the Customer details (cust_id, email, and note) are blank on the on the Hosted Payment page.

Here is a sample POST Form Data I'm sending when getting the preoload:
  'ps_store_id' => 'RFVYTtore2',
  'hpp_key' => 'hp6T46ZOOQBF',
  'hpp_preload' => '',
  'charge_total' => '1.11'

Here is the XML response I get back:
<response>
  <hpp_id>RFVYTtore2</hpp_id>
  <ticket>hpp1541655745xtrbuTep3cUE1pzlj</ticket>
  <order_id>mhp18311004225p71</order_id>
  <response_code>1</response_code>
</response>

With this response, I then generate the following form on the server side via PHP which then gets submitted automatically:

<form id="form-moneris-2" method="POST" action="esqa.moneris.com/.../index.php">
  <input type="hidden" name="hpp_id" value="RFVYTtore2">
  <input type="hidden" name="hpp_preload">
  <input type="hidden" name="ticket" value="hpp1541655745xtrbuTep3cUE1pzlj">
  <input type="text" name="cust_id" value="1234">
  <input type="text" name="email" value="test@test.com">
  <input type="text" name="note" value="190101">
  <input type="SUBMIT" name="SUBMIT" value="Click to proceed to Secure Page">
</form>

The POST Form data that gets sent is:
  'hpp_id' => 'RFVYTtore2'
  'hpp_preload' => ''
  'ticket => 'hpp1541655745xtrbuTep3cUE1pzlj'
  'cust_id => '1234'
  'email => 'test@test.com'
  'note' => '190101'

I'm then taken to the Hosted Paypage at https://esqa.moneris.com/HPPDP/index.php, but 'Customer ID', 'Email Address', and 'Note' are blank. Within the 'Hosted Paypage Configuration' > 'Appearance Configuration' > 'Hosted Paypage Data Fields' > 'Display customer details. (cust_id, email, note . . .)' is checked.

What am I doing wrong? Thanks!