Amazon screw-up

Possibly I'm worrying too much, but I feel it's worth mentioning: if you've been thinking of pre-ordering Stealing Light from Amazon, you might have noticed it comes up twice - as both a hardback and paperback with the same release dates. The hardback is at more or less full price - but the paperback is going for about half that. Please note: there is no paperback for sale. I know people are pre-ordering the (nonexistent) paperback because its Amazon ranking is way, way higher and they're doing exactly like what I would do, which is click on the one with the ridiculously low cover price. And yes, I've informed both my publishers and Amazon, by email. Fingers crossed.