Q: what happens if you are sleeping
Change your sleep schedule (or be a passive reader). Look everyone can't be everywhere all the time. People on the same side of the earth will tend to vote on each others stuff more than people on the other side. That is unavoidable and not a problem.
BTW: I had to paraphrase the question because quoting it using markdown is broken.
How is it broken? Looks fine to me.
I got some kind of diff-ish looking tags visibly displayed on the web page. I'll experiement with some test/spam posts and see if i can reproduce it