QxtSpanSlider weird issue, any other way to create a slider widget with 2 sliders?

[Bong.Da.City]

Here is a screenshot

H3DJF.png

Do you see that orange thing on the left? Why? This is the code i use

leon = new QxtSpanSlider(this);
    leon->setFocusPolicy(Qt::NoFocus);
    leon->setOrientation(Qt::Horizontal);
    leon->setUpperPosition(8);
    leon->setLowerPosition(6);
    leon->setMaximum(16);
    leon->setGeometry(QRect(0,0,350,100));

leon = new QxtSpanSlider(this);
    leon->setFocusPolicy(Qt::NoFocus);
    leon->setOrientation(Qt::Horizontal);
    leon->setUpperPosition(8);
    leon->setLowerPosition(6);
    leon->setMaximum(16);
    leon->setGeometry(QRect(0,0,350,100));

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If it is not possible to fix this issue do you know any other way to create a slider widget with 2 sliders?