Question.
In the last week, there's been a couple instances where I've gotten a lot of upvotes in a row, on unrelated questions. What I suspect happened is someone came across some post of mine accidentally, liked what they saw, upvoted it, then checked my profile to learn more about me, and then upvoted a bunch of other stuff.
Everything that was upvoted was in my "top posts" list, which is the first thing any profile visitor would see. So what I'm suspecting is serial-upvoting (like 5-7 things in a row, in two separate streaks).