Memories become jumbled over time. They distort, go out of order, and sometimes they might even begin to run backwards. What must be remembered is that specific memories can only belong to the person who originally had them. That being the case, memories will almost always be imperfect, and no two people will remember the same event exactly the same way.
You are entering the mind of Discord. Events will not always occur in a chronological fashion.
Believing Stories was only introduction. (Seriously, you need to read Believing Stories to not be completely lost here.)