Kata fixed just now.

Yes, I'd say that too. There seem to be a lot of issues with this kata.

You are mutating the input array like that, so the next time a test calls your function with a different number the result is wrong.
Copy and paste your function in repl.it like this:

arr = ["S", "L", "H", "R", "P"];

def whoIsNext(names, r):
  # your code here
  
print(arr)
whoIsNext(arr, 10)
print(arr)

Exactly. You're mutating the input. Don't do that.

You're mutating the input.

language?

first, please verify that the actual and expected are not swapped by printing to the console your result before returning it