MarketPress Confirmation Email not replacing field names

The emails I am receiving once I have placed an order are not replacing the field names like they are supposed to, the email I am receiving is as follows:

Thank you for your order CUSTOMERNAME!

Your order has been received, and any items to be shipped will be processed as soon as possible. Please refer to your Order ID (ORDERID) whenever contacting us.
Here is a confirmation of your order details:

Order Information:
ORDERINFO

Shipping Information:
SHIPPINGINFO

Payment Information:
PAYMENTINFO

ORDERNOTES

You can track the latest status of your order here: TRACKINGURL

Thanks again!

Is there any way to figure out why this is happening and a fix?