hi guys,
just recently, I bought a HVAC buddy app. but i feel some thing is wrong.
to calculate superheat , i plugged in 60 psi suction presure for r22 and suction line temp at 7 deg celcius. and the answer was -11.8 actual superheat .

If i would have done it on paper i would do suction line temp 7 deg celcius -60 psi(1 deg celcius)= 6 deg superheat. however app tels me -11.8 actual superheat. sorry i can't get it

please explain what is wrong been done by me.

Thanks