The Sports editors don't know anything about it. So that means a VG editor saw "Mishmash" and decided, based on some criteria, it was a better fit in his category and moved it (without informing the Sports editors or the author). Is that the gist of how it works?
No. Unless an editor works in both categories, they can't pull a quiz from the first category; editors can only edit in queues they are assigned to.
Either a discussion was had between editors and your quiz was moved for a reason that they mutually decided upon or it was moved by a single editor cleaning up between two categories they have access to.
The process is a bit irrelevant though; it made sense to go to another category and it was moved. Quizzes are moved quite frequently over the years, but to contact the authors for each one would be extremely time-consuming. Our editors are simply doing what's best for the quizzes in these cases. If a quiz originally in the Ireland subcat of Geography makes more sense in 'Mixed Ireland' in General, then it will be moved there based on the content. The site evolves constantly.