In Stock but Awaiting Stock?

Colour me confused. PC World has the Google Nexus 7 'in stock' to buy for either home delivery or pick-up in-store within 1 hour. Yet my order, which they've taken the money for on Tuesday, is still marked as order being fulfilled when stock is available. IF they have stock to take new orders, both in-store and online, they should have stock to fulfil orders already taken and paid for.