I started this day with reputation of 595. Durung the day several of my answers were upvoted quite a few times. But my reputation the whole day stayed planted firmly at precisely 595. No changes whatsoever. Is there something I'm missing about the way it is calculated? I thought it is supposed to go up as you get upvoted. (And that's the way it worked for me before.)
You hit your 200 limit cap. Meaning you can only get 200 rep in a day (not counting bounties)
Maybe some of your answers are now community-wiki.