It's been confusing me for too long already. Things I've noticed:
When there are multiple votes being cast on the same post in succession of each other, it constantly keeps flashing back and forth between a bunch of numbers. I just want to see what the current count is. I really don't care what the previous count was or what it's changing to and from.
While the vote count is doing all this flashing nonsense, I am unable to click on it to expand the vote count. Making me wait for the script to finish it's business isn't very friendly.
Once you've expanded the vote count and then the script re-updates the post with the new vote count, you are unable to then re-expand the vote count to view it again. This is especially frustrating when you just expanded it and then the vote count updates immediately afterwards. This means you have to reload the page to expand the count, unless you have magical eyes that caught the numbers in the split-second it was shown.
These issues may not be so prevalent on old, inactive posts where there's not a whole lot of voting activity. But on newer posts where there is activity it seems to be doing more irritating than being helpful.
Use a notification box similar to what's already in place on the home screen. Rather than "there are x posts with new activity" or whatever, put a popup somewhere that says "there have been additional votes cast, click here to reload the vote counts" or "there are new comments which have been posted, click here to load them." Give us the ability to reload them.