Map rating bug

[l3h3l]

Hi, recently noticed, that voted several maps and when coming back I can vote again. I know( tell me if I'm wrong), that you can only vote a map once/IP. It's annoying, because I finish a map like it or not and vote, but I didn't want to do it again. My question is, my vote counts, and could rate more than once, or my vote is being rejected and that's the reason I can vote again?

[Grauniad]

If you vote on a map, your vote is recorded and noted.

There are instances where the memory of you having voted is "lost" in which case you may be able to vote again. It is unfortunate. We never thought it would matter enough that we had to build a bullet-proof voting system.