Then you get the same result in your IDE and here, there is a problem with your code, because, you can see the next bigger number you can form with the digits of 144 is indeed 414.

// expected -1    <- Your function returned this
// to equal 414   <- This was the expected result            

Pretty sure you're misreading the logs, read this: https://docs.codewars.com/training/troubleshooting/#print-input

Print the input, what was it?