Barometer manual calibration & trend arrow bug?

Hi everyeone,

The factory barometer settings of my watch is about 2 hPa more than the official meteo aeronautical value, so, I must manually calibrate the barometer, but that make the meteo trend arrow down after 20-25 minutes. It stay down for the next three hours, the it rise.

The trend arrows stay down after every future manual or auto calibration. I think it's because the watch always reads the barometer factory value setting.

It is very annoyng. Is this a software bug?  Is there any way to fix it?

Thanks

Francesco