That is weird, never encountered that before, or.. did not notice. In the essence is just against everything that blockhain represents. Did it also give the rewards form the reward pool to the author after up voting multiple times? Bu since the block size is 3 seconds... it might theoretically happen that both upvotes were included in different blocks as separate transactions. That should be a front end issue then.
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A witness only include a transaction if he have consensus with other nodes who also have copy of the blockchain.
Double vote is like double spending. Not possible on any blockchain unless compromising the nodes.
I'm not worried about double spend then. Thank you for your elaboration on the topic.