Hi there,
Same problem here, using Prestashop 1.6.1.0.
Unbelievably frustrating, please, look into it.
All orders are saved correctly to DB, to table ps_orders. However matching records from table ps_order_details are missing, not a single row with id of order, which has missing products.
Anyone solved this meanwhile, any fix, idea? I do not mind doing clean install.
Cheers.