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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.
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Not an issue.
I'm not sure if this is what you're describing, but it sounds similar to a problem I had where I was trying to find subsequences when the question is really asking for substrings (it says find the largest sequence, which is a little misleading). For instance, if you have the number 957923992590, this has five 9's, and indeed the largest number that is a subsequence of these digits is 99999. However, the solution actually needs the largest substring (number formed by consecutive digits) from the number, which in this case would be 99259. Hopefully that answers your question.