Yeah this is not so much a bug, as it seems you need to setup your PayPal settings to "send the entire order as a single line item" in your Payment Methods config.

That should fix it. (I'd like to find a more permanent fix that involves being able to send the entire order line-by-line to PayPal but I don't have much time to devote at the moment ... hopefully TCS can look into it when he has a moment!)