Seems reasonable to me.
My Leaf has a 16a charger and I often see over 240v in my garage. So the charger starts pulling at x.5a and then floats around up to x.7a sometimes depending on the voltage. I see the same even if i limit x to 14 or 12 or 10. It doesn't care about the max limit it seems to try to honor the pilot signal request or float around the starting KW as the voltage varies. I'm not sure the logic but it sure isn't power limited (on a 50a circuit, 14-50 socket, 30a evse, 16a on board charger and it'll still floats around between 11.5a and 11.7a when my voltage varies from 241 to 246). Leafspy shows 2.5 or 2.6KW on a 12a setting for the EVSE (some rounding or truncation there).
I'd be fine with it pulling 12a no matter what and the KW fluctuating instead but it doesn't.
so if 72a x 240v = 17,280 watts aka 17.28 KW I wouldn't be surprised if the charger floats around 17.3 KW or less even if the hardware could handle more.