(I didn't find RadNumericTextBox in the category)
Telerik version - 2011.1.614.35

Auto complete box floats at a distant place, away from the RadNumericTextBox.
i.  The auto complete of IE 9 is on, enter some number, save the form.
ii.  Again open the form, focus on the numeric text box. The auto complete box seen is  not aligned with the control.