Op-amp and amplifying the voltage in negative range
If you look at the data sheet, on page 6 you'll find characterization at single supply, 55 volts. Input voltage is 0 to 53.5 volts. In other words, you can't have an input closer than 1.5 volts to the positive supply. Your inverter attempts to drive the inputs right at the V+, and this won't work.