Sometimes, I think we are just to quick - we need to slow down to a gallop (as my Gran used to say)!! *4U
I get double votes now and again, but that's the site being a bit slow and me being impatient. When you look a couple of seconds later you can see the flower has turned grey after all. Flower for you.
sometimes its my mouse clicker, not in the right place and then have to click harder than before, sometimes I give a flower on a page and it appears nothing happened so I click again and then it tells me double voted, but the 2nd one does not count on the same person