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Collections are a way for you to organize kata so that you can create your own training routines. Every collection you create is public and automatically sharable with other warriors. After you have added a few kata to a collection you and others can train on the kata contained within the collection.
Get started now by creating a new collection.
You have to learn to debug your code, nobody is paid to do the job for you. See: https://docs.codewars.com/training/troubleshooting/
Print the input, sometimes your code returns an array of more than 2 numbers.
How do you know that? You've implemented a wrong algorithm, and I think the implementation is wrong too. Not an issue.