It seems as if Amazon has problems with functional dependency of its product data.
Depending on with language is chosen on the Amazon.de webpage, for example German, there are books where the website language used remains English. In addition to that, this results in totally different editions of the books being displayed or different sellers being listed for the same book.
Also, when selecting “Foreign books” on an author’s Amazon page, nothing is selected, although one might expect to be shown the author’s original, untranslated works.
Sometimes, multilingual editions of books (which are mostly used for teaching foreign language at schools) show up instead of a particular edition in a desired language.
Shopping cart and wish list
There have been instances where I was unable to move items between different wish lists with a failure message from Amazon claiming it could not move the item, while said item was definitely not on the destined wish list.
This also fails when trying to add the item to a particular wish list directly form the product page. It makes not difference whether the item in question is already in the shopping cart or not during the time of trying to move it to the faulty wish list.
Shopping cart bottlenecks
When moving items from the Amazon shopping basket to the “Save for later” section, it is only possible to do this for one item at a time, and also only after each individual item has been moved is it possible to even click on the next item. This creates an opportunity for the underlying code to be restructured in support of faster operations.
Link rot
From the book “Superfreakonomics”, a link claims to lead to a webpage for the entire series of books, including “When to rob a bank”, “Think like a freak” and “Freakonomics”. However, when clicking the product link for the latter (https://www.amazon.de/dp/B074CB84JK?binding=mass_market&ref=dbs_dp_sirpi), Amazon claims it is unable to find the page:
Book editions varying in the number of volumes
When books gain additional volumes with newer revisions, one example being Rosenberg’s Molecular and Genetic Basis of Neurological and Psychiatric Disease, which fit in a single volume for its fifth edition, but grew to include a second volume in its sixth edition, product pages can list any part of the multi-volume editions along with books from the single volume editions.
Another example would be Karl Popper’s The Open Society and its Enemies, which initially was comprised of two volumes, but was later released as a single volume edition.