There is going to be much raging in this thread after orders re-open. Personally I would put a cooldown in effect before trades could be made to allow people to cancel/change their orders, but oh well.
Nothing is stopping people from canceling their orders right now.
Is the orderbook correct or those values not updated?
The orderbook values are correct - every cancel takes effect immediately.
The user interface may not update instantly (sometimes), but a refresh fixes that.
We are testing the updates/fixes now. Stay tuned.