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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.
I have the same problem
Hard to tell only based on Passed/Failed report.
The tests and final submission often use different tests, with the final submission ones being more extensive.
So you most likely have a problem with you algorithm that is not apparent in the simpler tests.
(Just noticed your comment is from 8 months ago, but I'm posting the reply anyway lol)