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@capnm - it does already do that. But the logic currently is to stop scanning on the page/file that it finds its first valid ISBN (parse that whole page before stopping). The assumption is that if a book had both a 10-digit and 13-digit ISBN, that they will both be in the same page/file and hence the ISBN13 will be selected it it exists on there. And as is the case here, that if the ISBNs were spread across different pages/files, that they refer to different books. It is not uncommon for books to have ISBNs for other books - just like in this case you have an ISBN for an audio edition.
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