I hear your thought process. but I think it is a mostly computerized system the orders that need to ship out right away might ship before they catch it..
But they starting catching them already.
A bit OT, but I used to think (or I was told?) that if you choose "expedited shipping" on price mistakes, you have a better chance of them shipping.
But then I was told that that cheshbon makes no sense bec "expedited shipping" means 'in-transit' time, not how quick it leaves the warehouse.
In this case, it seems different. Or maybe its just the orders that were placed earlier are getting through?