It is odd, but if it was incorrect I expect they would have appealed to the governor of the ASX by now.
I can see nothing on the newsfeed, where the QBE error came through within 10 minutes.
Also, it was not a single order placement. The order was placed in the auction and moved from 12c to 15c, then to 25c, and I forget where it ended up - I think 12c.