RangeSlider: Inadequate snapping to ticks

[maks991]

At now snapping to ticks in the RangeSlider doesn't work as it should. As soon as I start moving thumb it goes crazy jumping in an unpredictable way. I use MahApps.Metro v1.4.3.

XAML

<mapps:RangeSlider Minimum="0"
                   Maximum="100"
                   LowerValue="20"
                   UpperValue="80"
                   AutoToolTipPlacement="BottomRight"
                   Margin="20"
                   Height="20"
                   TickFrequency="5"
                   IsSnapToTickEnabled="True"
                   TickPlacement="BottomRight"
                   MinRangeWidth="0"
                   MinRange="0"/>

VIDEO

Also I recorded the video that demonstrates the problem (you can watch it in your browser, you don't need to download it): RangeSliderGoesCrazy.mp4