Incorrect stroking of straight curves

#include <QGuiApplication>
#include <QPainter>

int main(int argc, char *argv[])
{
    QGuiApplication a(argc, argv);

    QImage img(120, 120, QImage::Format_ARGB32_Premultiplied);
    img.fill(Qt::transparent);

    QPainterPath path;
    path.moveTo(11.28569, 13.087628);
    path.cubicTo(10.66069, 13.087628, 10.254441, 13.377808, 10.004442, 13.931381);
    path.cubicTo(10.004441, 13.931381, 3.5356915, 31.034938, 3.5356915, 31.034938);

    QPainter p(&img);
    p.setRenderHint(QPainter::Antialiasing);
    p.setPen(QPen(Qt::green, 3));
    p.scale(5, 5);
    p.drawPath(path);

    img.save("test.png");

    return 0;
}