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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 had the same problem. The tests feed back the output from your encode method to your decode method. So take a look at your encode method, especially the usage of javascript bitwise operations if you have them, like people have discussed below.