Today, for the second time in the last week or so, I've had a windfall of upvotes -- upwards of a dozen at a time. Each time all the votes have been within a few minutes of each other, which leads me to believe the same person is upvoting a bunch of my answers in the same session. Maybe I'm just looking a gift horse in the mouth and someone liked one of my answers enough to go through and upvote many others, but it seems a little fishy. Is anyone else seeing this kind of thing?
I wasn't responsible today, but I did spend a couple days a week or two ago trying to find interesting questions and answers to max out my votes for the day. Mostly in response to this and this and this. You often have excellent answers, so if anyone else was doing the same I wouldn't be surprised if you were bumped.
I checked your upvotes and I do not see anything suspicious; just a bunch of votes from known users. We did have another user report the same thing but I searched and could not find anything suspicious at that time either.
I know my usage of this site is similar to @Steve Jackson's. I come in and read through new questions and vote up the good answers and questions in one session. So that type of usage (and I bet that is a similar pattern for others) could explain why you got a bunch of upvotes all at once.