I am assuming your NE is a hunter? You probably trained a cat with prowl. Go into your pet tab in your spell book and right click “prowl” to turn it off. Your pet will move like normal
Hes on prowl, Look on your pets action bar (Should be right above urs) and click on it, It should come off.
The prowl slows them down but makes them down but makes them invisible there are proscons to this you must have cat with prowl later to sneak up on the pet bar.
The pet bar and it should stop prowl had this you can always use prowl button on the prowl later to sneak up on someone.