New instructors

There are a few new instructors at my studio. While they passed their exams recently, they are quite new to BM (they were not members before instructing) and not there with their form yet, often instructing incorrect positions, incorrect phrases, and either not correcting the class or correcting wrong.

I've been doing it for 10 years so I'm really put off by it and have heard others talk about it as well.

I'm afraid the owner will be defensive if I bring it up and offer feedback. What do I do??