The 'picker' should not show different values depending on the zoom.

The more detailed the zoom the more accurate the data but the point does not change and the value should not either.

zooming out must show 2.7 mm in that point not 18.6 mm

That is incoherent.

https://www.windy.com/es/-Acumulación-de-lluvia-rainAccu?gfs,rainAccu,37.801,-4.142,9,m:eIiaf2N

but occurs at any point of Spain

Choose 10 days rain accumulation

https://www.windy.com/es/-Acumulación-de-lluvia-rainAccu?gfs,rainAccu,37.801,-4.142,9,m:eIiaf2N

but occurs at any point of Spain

Choose 10 days rain accumulation

The more detailed the zoom the more accurate the data but the point does not change and the value should not either.

zooming out must show 2.7 mm in that point not 18.6 mm

That is incoherent.

The 'picker' should not show different values depending on the zoom.

Rain accumulation shows inconsistent values at the same point for different zoom levels with any model.
(Windows 10)