I don't get double my quota every day but I experienced to get 2 votes more sometimes. About 2 days ago I experienced that behaviour last time: I just had spend all my votes, visited some other sites, and when I came back to the monastery the nodlet showed "you have 2 votes left".

Update Just at the moment my nodlet shows "7 votes". One minute before it was "4 votes". I did not have more than one window open, but I searched for "unicode" the second time today, and of course I got the same result page. I think I experienced that kind of behaviour before: Maybe it is evil to visit one page twice.

Hanamaki