The hygrometer on Beam mini (2) deviates abnormally.

It is possible that some dirt/moisture has got onto the sensor. You can try to remedy this by following the steps below:

1 - Under the base of Beam mini (2) you will see a small plastic grille with a tab. By gently pressing this, you can remove the cover;
2 - Underneath the grille that has just been removed, there is another grille. This protects the air quality sensor;
3 - Clean this area with a slightly damp cotton swab;
4 - Boil some water in a kettle and hold it under the Beam mini so that the vapour passes through the grille;
5 - Replace the cover and fill Beam mini (2) with water again.