Just tried this with two different nodes, opened the same node in 3 tabs, upvoted in each, I can't reproduce your findings. I was only able to upvote once by the looks of it, and my remaining votes decreased by one per node tested, not per test.

In reply to Re: I can upvote a node multiple times! Well... sort of. by marto
in thread I can upvote a node multiple times! Well... sort of. by perldigious

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