No man it is a visual trick. Your down still gives a down, and your up still gives an up. As far as I know at least. It just fools you by lighting up the green when you click the down 'red' button. It is a trick. I am going to trouble shoot on you now.. one sec..

Here comes a downvote..

hmm ok the down gave you a down..

now I will reverse to give you an up and see what happens..
hmm working ok on my end..

ok I believe you man.. maybe it is only with your account.. or perhaps they reversed a setting.. I will dig into your account to see if I can find what is going on..

cheers