Definitely off-topic for this thread, but real quick, I could name a dozen or two exercises and techniques that “look” wrong but would be 100% appropriate under certain circumstances (intensity techniques, the lifter’s injury history, etc.). Long story short, you have no genuine idea why somebody’s doing something simply by seeing it from across the gym.
And, no, you’re in no position to “correct” them because you’re still a beginner yourself. Re-read your “Smith machine” and “Fat Gripz” threads for reminders on that.