Yeah, well, hunters are kind of like cops. Or not really, more like SWAT teams. So they kind of can do that. Of course Noblemen can cause a lot of problem to hunters if they really want to. So it would indeed be preferred to not step on their toes. Obviously some do. xD
Edit: Also do note, this is more of a steampunk-ish setting. So while nobility is still a prominent part of society, it isn't as influential as in a medieval setting.