I found out two bugs in kendo slider,
The first one is when you enable an slider which is enable the slider become crazy. When you go up and after go down two or three times, Slider does what it wants. You have to do sometimes a lot of clicks, sometimes a few clicks, but normally you have a click and it increase the value slider and that is not a good behavior.
The second one is when a slider is disable and you want to move the "circle" (drag and drop to change value slider) that raise too many errors.
var slider = $("#slider").data("kendoSlider");