This is a new feature for voting on posts. Before there was no option to undo a vote, now the option you selected (either up or down) will be shown with an undo icon. By clicking that and refreshing the page, you can remove your previous vote.
The idea is that one might accidentally down vote a post and would like to correct the vote without moderator intervention.
> By clicking that and refreshing the page, you can remove your previous vote.
As soon as you click it, your vote is instantly undone. (Refreshing the page is just for cosmetics)
How about reputation. Why i can't seem to give a guy reputation points. When i do that and refresh the page there is only a number 1 and a undo vote there. I can't see my rep comments. Is there something wrong with my account?
But you did give them rep -- the comments prove that. You will not see the amount of rep points either given or taken away in the arrows -- only -1 for negative or +1 for positive. You have to look at the person's avatar to see actual rep that the person has after you gave yours.
But I have not given Dani any rep for a few days now. I know my up vote does not affect actual rep points in this forum, but I should be able to reverse the up vote.