when entering values into the numeric updown control through the keyboard instead of using the up/down errors, the following will occour:

trying to enter: 127

Result: 271,00

after each keypress, it moves the cursor to the left and then appends the number to the left instead of to the right.

So if  the user wants to enter 127, he actually needs to enter 271.

This is the behavior of the .NET control in which this control is inherited.  We only added SF data binding to this control and it is not enhanced.  If you change the BindingUpdateMode to OnValidation you may have a slightly better experience, but this control is one we are going to replace with one of our custom controls in the future as it doesn't work well for user input.  We use masked controls instead.