MarketPress Checkout throws multiple errors

Hi Gurus,

Just tried processing a transaction through Marketpress default checkout page. Selected the PayPal option at checkout. Page updated to indicate it would redirect to Paypal.

on Submit, the page reloads and displays two error messages, but neither makes to me. because I added a single item to the cart and clicked purchase. How could cart totals and item totals not match?
Please see attached photo.