When changing the CurrentUICulture to a culture which requires comma as decimal separator (for example, German) - pressing the comma key does not work. You must press period. When pressing period "." -> "," is entered.

For example The minimum is set to 1000, but if i want to change the value via typing to 5000 you will see the issue, where it adds my new numbers on even after i have cleared the box

I've attached a sample solution to demonstrate the issue. Try to run it. There are two commands which change string format to currency and to percent  accordingly. So when you change string format by buttons on screen  it's not possible to see  it until  you tap on input 

I've attached a sample solution to demonstrate the issue. Try to run it.
When you run it you can see that it's not possible to see  value of numeric input until 
tapping on it  

RadNumericInput on UWP crashes as soon as you copy something and paste into the input. And it doesn't matter whether the copied text is numeric (12 for instance) or a text. I've attached a sample to demonstrate the issue.

If you modify the property which is bound to the Value of the RadNumericInput, through the ViewModel for example, you are able to set a value which is not in the range of minimum/maximum.