2CO Not Providing Accurate Order Summary - Only Listing Last Item

( NB: I've checked for duplicate threads on this but couldn't find any)

Currently preparing a client site (MarketPress/Product Theme/2Checkout) for live and have come up against the above issue.

Once an order has been confirmed and the customer is sent to 2CO, the order summary listng (on the 2CO side) is not accurate - in our tests, it listed only one (the last) item ordered (of three in this case). The issue is also reflected in the 2CO transaction confirmation email.

However the total value order is correct in both cases. Is this a known issue? It does need to be fixed, as it could cause complaints.

Thanks in advance

Philip (belucid)