What Am I doing wrong with substr method?

Tell us what’s happening:
Describe your issue in detail here.
Hi,
I know that this challenge can be solved using the slice method, however, I was curious why this code is passing at some tests and failing at some others?
I couldn’t detect a patern in the failed once.

  **Your code so far**

function confirmEnding(str, target) {
let length = target.length;
// eeven if I tried adding +1 it is still failing at the same words. 
// Is it taking  only one letter?
let result = str.substr(-1, length);
if(result == target){
  return true;
}
return false;
}

confirmEnding("Bastian", "n");
  **Your browser information:**

User Agent is: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:93.0) Gecko/20100101 Firefox/93.0

Challenge: Confirm the Ending

Link to the challenge:

Try to add console.log(result) inside your function and see if the value is the one you think with the function calls in the failed tests

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