I don't mean to be pedantic. I teach coding to elementary school students, and this is something fundamental I try to make them understand. A computer will always do what you tell it to do. A bug is when you accidentally tell a computer to do something different than what you'd intended.
Going back to the calculator example, if a student used a calculator and got the wrong answer, the problem didn't come from the calculator. This is useful to understand; it can help the student work backwards to figure out what did go wrong.
AI is different in that we've instructed the computer to develop and follow its own instructions. When ChatGPT gives the wrong answer, it is in fact giving the right answer according to the instructions it was instructed to write for itself. With this many layers of abstraction, however, the maxim that computers "always do what you tell them" is no longer useful. No human truly knows what the computer is trying to do.