There are two factors at play, it's Christmas and the dashboard still has issues I think, despite them taking down the notice.
My book currently has a sales ranking in its category which isn't reflected in the reported sales by a significant margin, almost a decimal point.
I'm going to wait until after the holiday period then if the figures aren't sorted raise it with them.
And the sad truth is that our loving family and friends download the free sample so they'll have something nice to say, or else they just smile and lie. Unless you have seen the sales acknowledgement, you don't "know for a fact" that anyone bought your book.
(Don't trust KDP to publish a print edition. Don't trust CreateSpace to publish an ebook. Each does one thing well and the other thing poorly.)