Issue with riemann integral, reset on restart (sometime)


I got an issue with my intregal template that (sometime) reset when I restart HA :

Here my configuration :

- platform: integration
  name: Grid Export Energy
  source: sensor.grid_export_power
  unit_prefix: k
  unit_time: h
  method: left

It’s seem to happen when I restart HA (from it’s menu) and only one a day. I really can’t understand why it’s do that…

I’am on last version (2023.5.4)

Can someone help me ?

Thank in advance

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