Shunt voltage of 0.2mV when there's no load

[flambert2]

Expected Behavior

I would expect the output to be near 0 when there's no load connected.

Actual Behavior

I get a shunt voltage of 0.20000 mV and around 3500mW when no load is present. also it seems that the resolution does not quite fit, I only see steps per 0.02mV I would expect around 0.009mV since I have a shunt of 75mV 100Amp.

Steps to Reproduce the Problem

get a 75mV 100Amp shunt, remove existing shunt resistor on ina3221 (CH1), connect the external shunt, connect the esp to the ina3221.
use the DisplayReadings example
set these values:
const uint32_t SHUNT_MICRO_OHM{750}; ///< Shunt resistance in Micro-Ohm, e.g. 100000 is 0.1 Ohm
const uint16_t MAXIMUM_AMPS{100}; ///< Max expected amps, clamped from 1A to a max of 1022A

open serial console.