I guess this could be posted under the forum or the site. I chose the site simply because voting seems to be used more often there than regular threads.
I've noticed on this article that post's positive rating cannot go past 20 votes.
Don't really know why there is this restriction but it if this is the max the system supports then could you consider disabling the positive vote button if it hits 20? It's not a big deal I guess but it would just make things less confusing for users.