Who in the group has had a similar experience?
Who perhaps knows why?
What needs perhaps to be done differently?
In nanoVNA DISPLAY menu:
* select the TRACE being used for Smith,
e.g. turn off/on or turn off all others
* select SCALE and set SCALE/DIV 1 x1
With NanoVNA-H_AA_20191018.dfu,
SCALE - REFERENCE POSITION settings do not affect Smith format plot centering,
but perhaps it may on some other firmwares
Because of (IMO) poor menu arrangements,
it is too easy to accidentally change trace settings for a wrong trace.
Oristo