Dewpoint Display

Greetings ,
On my current 9.81E Display the Dewpoint is reported as ,

Dew Point -12.5 Deg C

Temp 18.5 Deg C
Wet Bulb 8.0 Deg C
Depression 32.2 Deg C

The signed addition seems to be at fault.

Regards
J

hi
what is your humidity reading?