I hope the "published" column is the time at which that user downvoted you and not the time at which you posted the original content... there is less than 2s in between some.
It was the time of each of the downvotes. I'm pretty sure the behavior was done by a bot, because there were way more downvotes across a bunch of unrelated posts.
I have way more data than my own, and there's a few users I've identified who appear to be botting other users aggressively. Not sure where to drop that data set, but it'll be funny.