That's a new one! I'd email firstname.lastname@example.org and ask what's up. My guess is that it is hugely pornographic (I'm not sure that it's even possible to be too hot for Amazon, given what I've seen on the store in the past); or that they suspect plagiarism; or that they think it's public domain.
Do come back here and report what happens.
Later: I see that it's for sale on Amazon in a print edition, which would seem to rule out at least the first two guesses.
None of those choices are possible. My book was in print CreateSpace & Lulu since Jan 09. How can I actually send a message to Kindle? When I clicked on help, I thought I would be able to get to them, but I couldn't figure out how.
I sent DTP Support a note, and they responded. Apparently, someone bought my book and the Title had weird markings, so they asked for their money back. When DTP Support looked at it, the book was perfect, but it was marked "Draft." They alerted me to complete the Publishing process, but I missed their email so they blocked the book.
Now, they placed it back into Draft status, giving me an opportunity to complete publishing it, which I did. As far as I know, it will be made active shortly.
I don't understand how someone was able to buy it while in Draft status. I cant remember for sure, but I thought it was published.
It's probably a good idea to check things out after a few days of making changes. I remember a few times when things didn't proceed smoothly, due to me trying to recover from some mistake I made.