You may have got someone reported this issue, but just in case. This could be a bug.
When you update from amazon (or default webupdate search), the author field is updated; only if its a AUTHOR. Most of the books authors come as EDITOR and the author field is not updated.
You can repeat this bug with some books like this
9783642005770
Thanks
Shan



Shan, yes that's right. But we are not sure that it's not correct to save editor as author in the database. Probably we'll add the appropriate option in the next version