I'm confused as to what is mean by 600 votes and 25% or more of them being on questions...by "questions", do they mean questions that I've asked, or other user's questions? or is it total?
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The interesting part is "Voted on" - you can't vote on your own questions. ;)
Ergo: You voted on 600 questions and of all your votes at least 25% were spent on questions.
It means that you have voted at least 600 times and at least 25% of those votes that you cast were on questions rather than answers. You can't vote on your own question, therefore it is for someone else's question.