The voltage measurement isn't as exact as one would think. Also, even if it's right, the voltage per cell is above the standard but still perfectly fine.
As for distance measurements, the manufacturers blatantly overestimate (one could say lie) about the range. If you are 50kg, ride at 15kph in 25+ degrees weather maybe you can get that range.
But range always highly depends on the rider's speed and weight (and some other factors like temperature), so you can always only ever have a rough estimate. And Darknessbot estimates certainly closer to ground truth than the laughable Inmotion app claim.
In short, looks like everything is exactly as it should be with your new wheel