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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.
Read that: https://docs.codewars.com/training/troubleshooting/#your-solution-seems-to-work-or-is-close-to-working-but-still-fails-tests your code uses a global var, and that keeps its value when your function is called several times in a row. Make it local.
Which is the input your code is failing? What's your code? That'd help.
A problem in the kata is unlikely.
You probably didn't test the case that failed then.