Deleted test orders but product inventory hasn't been restored

I am setting up MarketPress. I had 2 test orders which I deleted so that my product inventory could be restored.

I trashed the orders and then deleted them permanently as per this thread:

https://premium.wpmudev.org/forums/topic/how-to-fully-remove-sales-orderclosed-order-details-on-marketpress-manage-orders

But the inventory hasn't readjusted.