Minimum and maximum values wrong on larger timeranges

[SchiSchi2]

Tried to show minimum and maximum values for e.g. an temperature sensor but the retrieved values are wrong.

Example:
Lets say I select last 24 hours in the time range selector. The minimum temperature is 21 degree celcius. If I now select last 6 months I get 23 degree celcius as minimum value.

Tried both with the aggregation option in the query and also with the calculation option set to minimum/maximum under Value options >> Calculation. Also in combination with both.

Additional information under https://forum.checkmk.com/t/checkmk-datasource-in-grafana-shows-wrong-max-min-values/49985