I have a very simple example with a RadNumericTextBox control set to allow a maximum or 20 numeric characters with a MaxValue of 99999999999999999999. The issue is after entering 16 or more digits and then make the control lose focus causes the value to change. For example, 88888888888888888888 changes to 88888888888888880000. 99999999999999999999 changes to 10000000000000000000. Please help me make sense of what's going on. In my opinion, the value shouldn't change.