By default, any order that is not closed, held, or cancelled will be attributed as a sale – even if it is still in a Processing state, for example. The reason that this is the default functionality is that many times merchants don’t move completed orders to a Complete state, even when they are truly completed.
If your orders are consistently moved to a Complete state when they are completed, let us know and we’ll enable a setting that will only attribute orders in the Complete state.