You are correct. I seemed to be having difficulty calibrating with NanoVNA-Q-0.4.2-bf9c4ba, so I flashed with NanoVNA-H_v0.2.3-2-g8ac9166_20191018.
I got what seemed to be a good cal. I then saw (range 130-230MHz) open, 50 O, and short stayed on Smith real axis, exactly where I thought they should be (R, C, L).
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On the banks of the Piscataqua
Rich NE1EE