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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.
You are not using it right, then, as you probably use it on some intermediate result, so you get the rounding problem when summing it to other stuff.
It does not look much like "properly" rounding, actually...