Well, it happens. Authors mess up. I'm sure you've read books with typos or continuity errors in them (in one chapter the protagonist has black hair, in the next he's a blond). I've caught some typos in my printed books, but never before anything as egregious as this.
I SCREWED UP. I am here, with egg on my face, to apologize: No, Reisen's missing hand did not magically regenerate in the scene with Melody where she says she felt his "two big hands" on her bottom. TWO hands.
Here's how it happened: That scene originally happened with a different character, not Reisen. Reisen had a whole subplot where he was hopelessly infatuated with Serai. But that subplot took away from the book - it was a distraction, and not a good one. As a writer, my firm law is every scene must advance the plot or deepen understanding of character (preferably both) or it gets kicked. So Reisen in love with Serai? Got kicked. But then I noticed that Melody had kind of a thing for Reisen.
What could I do? I had to let them play. So the scene I'd deleted, the one in the bank vault with Melody and another character, came back. But this time I played with it and it came back with Reisen, because oh, wow, the chemistry between those two? Smoking hot!!
What I didn't do, obviously not carefully enough? Triple and quadruple check the details. Reisen did NOT magically grow back a hand. (I could have told you some mumbo-jumbo about Atlantean mental powers that made her think he had two hands, but that would be dishonest and cover-my-butt-ishness and I wouldn't do that. You deserve better.)
The simple truth is that I missed it. We all missed it, at every stage of production, but the fault and blame lies squarely with me. Every word in my books is my responsibility and I should have caught that. You can be damn sure I'll do my best to get it fixed in subsequent printings.
I'm sorry. I'm only human, and I missed this one. I hope you can forgive me.