I don't know that I would call it a bug. There are two different numbers - the demand you have scheduled, versus the actual resource net consumption. If you have resources banked, those numbers are equal. If you run out of something, you want to know how oversubscribed you are - not that your net is 0, so it's showing the right thing. The only case where you really want to know the actual net is when you are oversubscribed on the opposite resource, but it could still be useful to know the scheduled metal demand as well.
So what I think would be nice is to see both scheduled demand and actual net, but only in the one case where it actually matters.