I've been selling books on KDP ads and also a paperback book on CreateSpace, but for 3 days they haven't been recorded on KDP reports. A sale just showed up this morning (Sunday 1/15), but the books sold over past 3 days haven't been recorded. Why?
Create Space sales show up on your CS dashboard, not KDP, so you wouldn't expect to see them here. As for your sales from KDP ads, are they e-book sales or orders? Many orders don't make it through as sales, if, say, the payment card has been declined.