Hello,
They are currently in that lovely state of flux when they are coming in, going out, in transit, and generally constantly changing. The computer that 'predicts' availabily gets a little out of whack in this situation (and looks at multiple warehouses for one answer).
Many are already in transit to shops!
Supply is likely to be more settled in a couple of weeks.
Supply may be tight, but we predict we will have them 'in (open) stock' in a few weeks.
(I expect existing orders will be filled in the next couple of weeks.)

The random QA samples Jason and I checked out were great!
Have fun,
David