The default value of the NumberDeciamalDigits is 2. This is what says the MSDN documentation
The number of decimal places to use in numeric values. The default for InvariantInfo is 2."
The value of the numeric is formatted before it is displayed, that is way the property is changed.
Also, the Value property is updated on LostFocus. You could set the UpdateValueEvent="PropertyChanged" property of the RadNumericUpDown control.
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