Current measurement op-amp calculation
Figure 1. Low-side current measurement voltages.


Since (2) is connected to ground the voltage at that point is 0 V, not 49.97.
With 30 A flowing through the load the voltage at (1) will be + 0.030 V, not 50 to 60 V.
If you power the chip at (3) with 3 to 36 V you will be OK. I would be generous and use 5 to 30 V.