Jumping up is because they are spawned above ground, but did not move already (sometimes because no grid).
When you hail them, EQ client moves them to the location told by server, with new facing. As iot was above ground, they appear to jump.
This does not seem t happen to mobs having moved already because client has computed correct z value during for wp move.
Wouldn't bet much on that, but that's what it seems anyway.
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