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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.
Sorry but it's not a problem of the kata; maybe a CW problem. You can report an issue at CW. Look at the left panel where you can find "Bug Reports" in "Forum".
Note at the top of the page: that didn't prevent 268 guys to pass the Rust kata. My reference solution takes about 1500 ms.