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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.
It is not a bug in random tests, but your bad luck is that tests for some languages (including Swift, and Haskell IIRC, possibly some others) have test cases for very long sequences. You need to find a way to deal with sequences of billions of numbers.
There is an open issue about the task being inconsistent between languages, but it hasnt been fixed yet. It;s also not decided if a fix would be to make all languages easier, or all languages more difficult :) So basically you need to find a way to deal with sequences of many, many, many, many numbers.
Pluto is no longer a planet since 2006: https://www.loc.gov/everyday-mysteries/astronomy/item/why-is-pluto-no-longer-a-planet/