Monsters mimicking human speech are always unsettling
I vaguely remember Manticores doing exactly that , at least some versions of it.
In those versions it mimicks the cries of distress of its prey to lure new prey.
Usually prey animals, to attract other hunters/scavengers, but it'd work for humans as well.
All Pantheras ( that's tigers, panthers, and leopards ) have a similar trick..
The cute chirps they can make while looking cuddleable are, in fact, an invitation to Dinner.
Theirs, not ours... Monkey ( that includes us, from their point of view ) is most definitely on their menu. And they've evolved behaviour to let us walk right into that trap...
So yeah... it's unsettling.. Because deep down in our monkey brain we
know this, and also know we'd still fall for it.