This is somewhat vague, which monk / where?
I believe I know the one you are talking about.
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In the Basement, the 2 stairs to the west of the "7" the monk should path up and down that hallway, north to south, stopping at the corner in the north, and the top of the stairs at the south.
Currently that one pather is warping up into fireplace area 1-2 levels above where he should path.
But as posted before, this is a Z-Axis issue which I think they have resolved just not patched yet?