I think this more a UI issue. Steemd.com clearly shows that your first vote was recorded on the blockchain.
RE: Steem Bug - Multiple Votes From Single User on One Post
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Steem Bug - Multiple Votes From Single User on One Post
Normally steemit.com says "You already voted in a similar way" when I try to upvote a post that the website "forgot" about. This is the only time I caught it let me actually upvote a post that my browser isn't aware I already upvoted.
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That's why I think it's a user interface issue with steemit.com. I have voted twice on the same post before by mistake but using other interfaces other than steemit.com
Downvoting a post can decrease pending rewards and make it less visible. Common reasons:
Submit
Ah okay, gotcha. Thanks!
Downvoting a post can decrease pending rewards and make it less visible. Common reasons:
Submit