Incorrect daily kWh values when using utility meter

Configuration
1

I have a Teckin SP22 which is monitoring 1 of my appliances (a kitchen boiler). This SP22 is running on Esphome and is configured the following:

    power:
      name: "${plug_name}_power"
      unit_of_measurement: W
      id: "${plug_name}_wattage"
      accuracy_decimals: 0
      filters:
        # Map from sensor -> measured value
        - calibrate_linear:
            - 0.0 -> 1.14
            - 279.17188 -> 40
            - 13879 -> 2061
        # Make everything below 2W appear as just 0W.
        # Furthermore it corrects 1.14W for the power usage of the plug.
        - lambda: if (x < (2 + 1.14)) return 0; else return (x - 1.14);
        # Transform all values to positive ones
        - lambda: return fabs(x);
        - median:
            window_size: 5
            send_every: 5
            send_first_at: 1
    change_mode_every: 8
    update_interval: 2s
  - platform: total_daily_energy
    name: "${plug_name}_total_daily_energy"
    power_id: "${plug_name}_wattage"
    filters:
        # Multiplication factor from W to kW is 0.001
        - multiply: 0.001
    unit_of_measurement: kWh

In my previous setup I used the following method to output the total daily power in kWh: sensorwatts -> Integration sensor -> utility meter (reset daily) -> MQTT sensors which is updated every night at 0.00

I would expect that both daily sensors would output more or less the same value, but when I look at the total_daily_energy is reads 1.2 kWh (at midnight) whereas the MQTT sensor reads 17.165 kWh. I certainly hope that 1.2 kWh is the right value, but I cannot understand why the MQTT sensor is so off.

Anyone an idea what is going wrong?

Find all relevant yaml for the MQTT stuff below:
configuration.yaml:

utility_meter:
  daily_energy_boiler:
    source: sensor.sensor_energy_boiler_integral
    cycle: daily
sensor:
  - platform: integration
    source: sensor.energy_boiler
    unit_prefix: k
  - platform: mqtt
    name: mqtt.dailykwh.boiler
    state_topic: "homeassistant/dailykwh/boiler"
    unit_of_measurement: "kWh"

automations.yaml

- id: daily_kwh_boiler
  alias: Daily KwH boiler
  trigger:
  - at: 00:00:01
    platform: time
  action:
  - data:
      payload_template: '{{ states.sensor.daily_energy_boiler.attributes.last_period
        | float }}'
      topic: homeassistant/dailykwh/boiler
      retain: true
    service: mqtt.publish