I had the same issue and reported it weeks ago, though in my case, they weren't actually adding up after rounding. They deleted my question without answer, comment, or notification.
You're right that you can't proceed like this. Since they're deleting questions about the issue and offering you brilliant advice to the effect of "Just falsify your return to make the rounded numbers add up!" I think the only move is to return TurboTax for a refund and use something else.
They don't seem to be taking this seriously, and you can't make them.
