widget doesnt function

[lse-git]

hey, for me the widget does not work at all. if i press the up button, it goes up by one, but then stops working. if i then press the down button, the value decreases by 2 even tho my step size is 1. after that, the down button also doesnt work anymore.

QuantityInput(
  value: 1,
  minValue: 0,
  maxValue: 100,
  acceptsNegatives: true,
  step: 1,
  onChanged: (value) {
    print(value);
  },
)