It is normal. Humans are all individuals, and what works for one might not work for another. On top of that, when people find something that works really well for themselves, naturally they like to share that. Especially if they are teachers. The trick is to find the bits of advice that work for you, the student, and acknowledge (but ignore) the ones that don't work for you.
My parents both studied music, and they had many anecdotes about their teachers. My dad's main teacher was very deep into eastern philosophies such as transcendental meditation (this was the 60s, after all). This was good for breathing technique (he studied clarinet) but not very useful (to my father!) in other ways. But in those days you didn't talk back because the professor's opinion was law, so he quietly dismissed what wasn't useful to him. And my mother studied violin and told many stories of her volatile temper, to the point of once nearly smashing her violin on top of her teacher's head. Luckily she never ended up doing that ^_^
It seems the older one gets, the more strongly they believe in their own ideas. So the ones with the strongest opinions are probably often old fossils 🦕 😃 Wise, but rigid. Take their wisdom, ignore their rigidness.
That said though, there are certain ideas that no one should disagree on. For example, no one would agree that rhythm can safely be ignored. Or that it is smart to play until it hurts. Or that one should stick out their elbows at 90 degrees and hold them there. Those are obvious (and silly) examples, but I'm sure that can be applied to less obvious practices as well.
So out of curiosity, what specific conflicting suggestions are you getting?