This behavior occurs if the slider button does not fit the scale graphic in height.
First of all, please open the question for editing and re-save it.
Then, please scroll down to the slider settings (Detail Settings -> Slider). You'll find settings for the position of the minimum and maximum, there. Click into one of the inputs of the minimum (this will highlight the line) and then click the middle of the minimum position on the slider below. Repeat the same with the maximum. Eventually adjust the Y values.