QDoubleSpinbox over range when setting a decimal precision of 3

Considerating these two spinboxes :

secLongSpin = new QDoubleSpinBox();
secLongSpin->setRange(0, 59.999);
secLongSpin->setDecimals(3);

altSpin = new QDoubleSpinBox();
altSpin->setRange(-100000.00, 42849672.95);

For the secLongSpin, if I input manually 59 then pressing the up arrow, the value is set to 60.000 which is over the range given.

If I do the same thing with the altSpin, by inputing 42849672 then pressing the up arrow, the value is correctly set to the max : 42849672.95

So, I think there is a bug, on the secLongSpin which could be related to the precision set to more than 2 decimals ???