Need help with akarui digi dry cabinets

[Ocean82]

Hi,

I need some help with Akarui Digi Dry Cabinet (Model No E26D).

The meter stays at 50 for a long time but will drop down to 35 the next morning.
It the same no matter where i adjust the settings.

Can someone shed some light? been trying for days

 

[Diavonex]

That's because no one open the cabinet during the early morning hours.