Slider control sometimes doesn't update the chart

Steps to reproduce:
1. Open any demo with a slider, for example [axis tick controls](https://jsfiddle.net/gh/get/library/pure/highcharts/highcharts/tree/master/samples/stock/xaxis/ticks/)
2. Drag & drop the thumb
3. Click on the slider's background to change the value. This step sometimes must be repeated a few times.

I suggest it's a problem with controls, because the first time I observed this issue was in the [legend's sample](https://jsfiddle.net/gh/get/library/pure/highcharts/highcharts/tree/master/samples/highcharts/legend/align/) - when playing with x/y value.

Attaching a vid of the issue: