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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.
This is expected behavior coming from random tests. Your solution has some bug which causes only some type of inputs to fail. see this for some details: https://docs.codewars.com/training/troubleshooting#works-but-no and this on how to debug your solution: https://docs.codewars.com/training/troubleshooting#print-input
Its most probably not a kata issue, but if you can confirm its a kata bug, feel free to reraise it with further details.