I presume the award is per seat in plane, not location. In other words, the award seats on a route is the same worldwide and not a few seats for UK, US, Europe etc.
Over the past few weeks many people have booked their holidays. Either they want to escape events, have a cheaper holiday or were worried about Avios changes.
I am personally expecting more seats to come into the system once the whole system has relaxed a bit more. There are also IT issues going on at the moment as well.