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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.
Your code fails with tests like this for instance.
And because there are random tests, the number of tests your code fails is random too.
Paradox is that you raised an issue for a kata but it's your solution which is wrong.
If you checked errors separately and code produced desired result, but when tested in bunch it did not produce desired result, then you also probably should test the code with many inputs, and not separately.
If you still cannot find the problem with your code, you can post it here so we will take a look (remember about markdown formatting and spoiler flag when posting code!).