Ok heres what I can see wrong...but maybe you can explain why you did it that way.
The shutdown controller circuit already have a pontential divider (3K, 1K) at its VACC input, this accept 12V and reduce it to a level that the logic circuit can take.
On your diagram you are again reducing the VACC voltage down by the (100K, 47k with another 47K). By the time the shutdown controller receive the original VACC its gonna be too low to trigger it.
You are using 2x47K in parallel...no need unless you really want this resistor value.
Im not too sure why you are directly feeding back the output of the gate back to the other one. Your circuit input and output seems to be clashing.