Total Energy and Daily Ennergy jumps by KWs when power comes on

Hi,
I have a very strange thing about my daily energy and total energy. It jumps by 21kw when power comes on, after that it seems to increase gradually.
Here is my integration for this entity, it is configured in configuration.yaml

This takes w to Kwh

sensor integration:
  - platform: integration
    source: sensor.kaz_geyser_power
    name: Kaz Geyser Energy
    unit_prefix: k
    round: 2

Then I have a a utility meter for daily totals

utility_meter:
  daily_energy_kaz_geyser:
    source: sensor.kaz_geyser_energy
    unique_id: sensor.kaz_geyser_daily_energy
    cycle: daily

Below it can be observed that when to watts goes to almost 2000W the Total Energy jumps immediately by about 21kwh and from thereon it seems to do the calculation correctly by steadily increasing the energy.
I am not sure why this happens and hope there is some logical explaining for that and a easy fix.

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