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The merge is, as I understand it, between the identical matches used from Amazon and from Google. Since there was no match from Google, I don't think there was a merge of metadata.
Amazon returned two matches, one was right, the other was wrong. I suspect that calibre use a very simplistic method to choose which to use. Either the last one or perhaps the one that is longest. Or has the earliest publishing date. Either way calibre can easily be fooled if more than one matching book is returned.
To make Amazon return only one book you could include the name of the author in the search. I suspect that only one match will be returned from Amazon then. And perhaps there will be a match from Google as well.
So the problem was that you provided too little information about the book to make the search successful. And Amazon tried to be helpful and suggested a book (document) that was about the same topic.
If you had run the search interactively you could have compared the matches and chosen the right one.
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