I wouldn't have a clue on that, the only thing I could suggest is to close your browser and then reopen the site. I have the add on slider from Tamper Monkey and sometimes it messes up and won't be recognized and so when I go to vote even if I have it 30% it would vote at 100% and closing the browser and reopening it would clear that issue up. Other than that suggestion , I don't have one to offer.
Even if you can't vote it, I appreciate you stopping by and reading commenting. It means more to me than the up vote any day.