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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.
careful with JS sort method. It's not "stable", when it comes to handling several items with the same "kay" value.
Hence, not an issue (issue==wrong kata), but a problem in your code. You have to deal with the JS version available here.
cheers