Issue with xBilling

[TGates]

When I view the invoice, this is what the paypal button looks like:
   
As you can see, it is not populating all the values. (I'm using sandbox, but that should not matter.)
Doing some more digging today.

Source view, another invoice (Change real domain to 'domain.com'):

PHP Code:

<form action="https://www.sandbox.paypal.com/cgi-bin/webscr" method="post" target="_top">
    <input type="hidden" name="cmd" value="_xclick">
    <input type="hidden" id="payment_method_id" name="custom" value="">
    <input type="hidden" name="business" value="sales-facilitator@domain.com">
    <input type="hidden" name="lc" value="{{country_code}}">
    <input type="hidden" name="item_name" value="{{invoice_desc}}">
    <input type="hidden" name="invoice" value="{{invoice_id}}">
    <input type="hidden" name="amount" value="{{invoice_amount}}">
    <input type="hidden" name="currency_code" value="{{currency}}">
    <input type="hidden" name="discount_amount" value="{{discount_rate}}">
    <input type="hidden" name="notify_url" value="https://www.domain.com/signup/ipn_listener.php">
    <input type="hidden" name="return" value="https://www.domain.com/signup/view_invoice.php?invoice={{invoice_id}}">
    <input type="hidden" name="button_subtype" value="services">
    <input type="hidden" name="no_note" value="0">
    <input type="hidden" name="bn" value="PP-BuyNowBF:btn_buynowCC_LG.gif:NonHostedGuest">
    <input type="image" src="https://www.paypalobjects.com/en_US/i/btn/btn_buynowCC_LG.gif" border="0" name="submit" alt="PayPal - The safer, easier way to pay online!">
    <img alt="" border="0" src="https://www.paypalobjects.com/en_US/i/scr/pixel.gif" width="1" height="1">
</form> 


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PS: all data is in the DB.