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It's a little confusing...
I voted on the bottom question but don't think I've touched the top one at all.
I have had the "reputation cap" tool-tip as in the question @Mat has just posted.
This did indeed change recently, we switched to an entirely different data source. What you're seeing is the result of up/downvotes, or changes that resulted in no rep.
We'll exclude changes that had no rep impact starting with the next build.