I add some products in phone. Then I login to desktop later for modification and order. Cart is empty. That's engineering smell. A really bad one.

Thats nothing more than UX/UI.

> In computer programming, a code smell is any characteristic in the source code of a program that possibly indicates a deeper problem. Determining what is and is not a code smell is subjective, and varies by language, developer, and development methodology.

- https://en.wikipedia.org/wiki/Code_smell