This behavior is expected by design - when the IsSnapToTickEnabled property is set to true
, the value will be automatically coerced to the nearest Tick value. In your case, the SmallChange property is set to 2. Clicking any of the handles will increase/decrease the value by the amount specified in that property. After tick 4, the thumb will try to move to 6 but this thick is not specified in the Ticks property so will go back.
As a workaround, you can create your custom layout using a RepeatButton element to implement the desired functionality. I have attached a sample project demonstrating this approach.
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