@SGaist QT 5.11.2 Mac Os 10.15 Catalina. If you try to scroll abroad, the slider will jump off her. Attached a video of what's going on. https://telegra.ph/QSlider-10-23
@SGaist Built under Qt 2.15.3. It got better, but the problem didn't disappear to the end. I hooked up a mouse to the MacBook, and the slider stopped bouncing. Looks like the trackpad or qslider is too sensitive, so qslider bounces back