For future questions, please provide more detail, as the best I can do is assume. That's never a great way to deliver support. : )
It sounds, though, like you have edited the View in such a way that it's causing duplicate results to show. This can happen when you add a relationship to the View from the Order table to some other table, like Line Items or Customer Profiles where there may be multiple entries per order.
Views doesn't limit you from displaying the same order multiple times, because it doesn't know that you're trying to show order fields at all. It just performs the query, finds multiple results sharing the same base order data (perhaps one per line item), and then renders them as separate rows in the table.
Revert the View or fix your configuration, and the problem itself will disappear.