I've already had a couple questions on this, so it's worth repeating. Our polls are designed to maximize participation for everyone. One of the ways we do this is to no repeatedly query the database. When you cast your vote it is recorded in the database, but your instance of the poll is not rebuilt which saves a database call. The system shows you the new total (by adding one to the totals it previously fetched) and the database has the new total, BUT If you refresh your browser it will appear as if your vote disappears.
Rest assured your vote is safely recorded and everyone else sees your vote. If you close your browser completely the next time you load the poll the totals displayed will include your vote.
On another note we'll be sticking with our normal policy of not altering the polls. Sites that do not wish to participate can simply ignore the competition; it will be over soon enough. Removing a site from a poll is a disservice to those who nominated and voted for it. We did honor requests from blog authors declining their nominations during the nomination period.
Lastly, imagine the entire internet linking to your site all at once... I ask you to imagine that just in case we have server issues today. We think we've got enough horsepower to make it through what is normally our busiest day. If for some reason you can get through try back a little later.