The problem is that there is no ratiometric relationship between sensor supply and ~1volt Aref of the Wemos.
You never will have a stable zero and stable current readings.
For testing, change this line
float voltage = sensorValue * (5.0 / 1023.0);
into
float voltage = sensorValue * (3.3 / 1024.0);
I assume you know that the ACS712 (and the circuit boards) are not designed to measure 230volt AC.
Potentially very dangerous if you are planning to measure three fase currents in a metal/grounded cooktop.
Leo..