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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.
For the sorting colors, it's already fixed.
For the output, please mention the language. I'm closing this for the lack of details. You're welcome to raise a new suggestion with more information
Almost 40 Codewarriors succeeded in C# without problems so it can't be an issue for the kata.
It can be a Codewars site error, it happens when too busy.