This has been happening for a number of weeks now: I'll vote something up or down, and it will display as it should while I'm on that page. If I reload it, or come back to it anytime later (could be two days), the arrows display the previous vote properly, but the count is wrong. If I click the same arrow, it undoes the vote, but does an unallowed addition or subtraction.
Example: I'll come back to a post that only had +1 from me, no one else. The up arrow is displayed, but the count is actually at 0. When I click upvoat again, it undoes the vote, but it now says -1 for votes. If I reload the page, the count is back to zero. If I upvote it, it will display as +1, but if I reload once again, it will say zero again. The same exact thing happens with downvotes, only the count will display as - -1 if I undo it.
From what I can tell, it's like this for everything I vote on. Is there some sort of temporary mechanic or whatever that makes such behavior intended? If so I've never noticed it before maybe a month ago, but I can't tell if my votes are actually counting or not.