That's right.
I always tell my students that if their system gives them results that are 100% correct, there is a problem. This is a computer program that is learning. When you learn from hundreds of thousands of pieces of data, you cannot be certain that all the data being used for learning is right. Systems always have degrees of success, which are used to evaluate their capacity.
Take ChatGPT, for example. It may give you the right answer to a question today, but it may also give you the wrong answer sometimes.