SEN0211 sensor is never zero, also wrong output

I'm trying to measure Power from an SEN0211 sensor using a Firebeetle 2 ESP32-E. I changed the code (VREF and 4096 instead of 1024 in the division of VoltageVirtualValue,  code posted below)

the sensor reads ~.85A even when not any power is drawn, and when I hook it up to a 830W toaster (~3.7A@220V, I measured it with a seperate tool) it reads ~2.2A. 

The output of the sensor non-zero even when its not conneceted to anything, so a higher precision ADC probably won't make any difference. Is my sensor malfunctioning?

Thanks in advance for anyone who can help me :) Anyways, here's my code, mostly identical from the product page:
 

/*!

* @file readACCurrent.

* @n This example reads Analog AC Current Sensor.

* @copyright Copyright (c) 2010 DFRobot Co.Ltd (https://www.dfrobot.com)

* @licence The MIT License (MIT)

* @get from https://www.dfrobot.com

Created 2016-3-10

By berinie Chen <[email protected]>

Revised 2019-8-6

By Henry Zhao<[email protected]>

*/

const int ACPin = A2; //set arduino signal read pin

#define ACTectionRange 20; //set Non-invasive AC Current Sensor tection range (5A,10A,20A)

// VREF: Analog reference

// For Arduino UNO, Leonardo and mega2560, etc. change VREF to 5

// For Arduino Zero, Due, MKR Family, ESP32, etc. 3V3 controllers, change VREF to 3.3

#define VREF 3.3

float readACCurrentValue()

{

float ACCurrtntValue = 0;

float peakVoltage = 0;

float voltageVirtualValue = 0; //Vrms

for (int i = 0; i < 5; i++)

{

peakVoltage += analogRead(ACPin); //read peak voltage

delay(1);

}

peakVoltage = peakVoltage / 5;

Serial.println(peakVoltage);

voltageVirtualValue = peakVoltage * 0.707; //change the peak voltage to the Virtual Value of voltage

/*The circuit is amplified by 2 times, so it is divided by 2.*/

voltageVirtualValue = (voltageVirtualValue / 4096 * VREF ) / 2;

ACCurrtntValue = voltageVirtualValue * ACTectionRange;

return ACCurrtntValue;

}

void setup()

{

Serial.begin(115200);

pinMode(LED_BUILTIN, OUTPUT);

}

void loop()

{

float ACCurrentValue = readACCurrentValue(); //read AC Current Value

Serial.print(ACCurrentValue);

Serial.println(" A");

digitalWrite(LED_BUILTIN, HIGH);

delay(500);

digitalWrite(LED_BUILTIN, LOW);

delay(500);

}