How does “Reputation” work?
The FAQ clearly states that the reputation limit is 200, except for when an answer is accepted.
Why am I getting reputation for upvotes after I've hit the limit?
The +15 reputation you get for an accepted answer will never count towards the daily limit. From my quick-scan of your reputation thus far today, you're currently sitting at exactly 200 / 200 (because of the downvote) for the reputation cap. Any +15's you get for accepted answers are not considered in this calculation and are always added on.
You aren't. Your 90 points' surplus comes from the six accepted answers you've had today.