I would def be more clear in the description on what you want for the user. I had to check the expected output to understand what you were going for. But all in all great kata!

There can be a variety of reasons. Maybe because the tests stop as soon as they found an error ;)

Without more indication it's impossible to help you (language, logs...). See if this may help: https://docs.codewars.com/training/troubleshooting/

I'm using math.pow in a list comp and I'm wondering why every test case passes except the very last one