While I have not a lot of content to chart on, anyway, I was to think Storygraph relied - mostly - on Goodreads as for the books' descriptions, thought it doesn't seems always the case:
https://www.goodreads.com/book/show/216752459-star-wars
https://app.thestorygraph.com/books/...f-02ec014631a3
I mean, in there Storygraph has a correct authors' details.