I got this too, but I was probably the worst recipient of downvotes percentage-wise and the upvotes didn't even make up for the downvotes yet in terms of absolute karma value (let alone in ratio, which would require getting many times the upvotes).

I also noticed that my recent upvotes included a fair number of 2s and 3's and higher numbers, and there were some posts that didn't get voted up at all--in other words, they were distributed in a way I would expect if the upvotes came from multiple people. The downvotes from Eugine were not distributed that way, making it a dead giveaway that they all came from one person.