The behavior is quite normal. All aquierers have a similar risk evaluation.
They will either

1) Require up-front deposit
2) hold back transaction payments (to the shop) for a given period
3) both of the above

Even if shop closes. The withheld amount will be withheld for a given time.
This is because fraud might be reported for a long time after initial transaction.
Its simply to cover their own asses.
PP, Amazon, Apple and others are their own aquirers, simply because no card aquirer will agree on the risk of their 'one click' solutions.