Within the past two hours, this user has been downvoted nine times, twice on the same question. It looks to me that someone has an agenda against this person, so why hasn't this anomalous voting pattern been detected and nulled by the system?
Because the user in question has had a lot of votes already it will be a while before any new concerted effort will show up in the moderator tools. I'll look into it anyway, but I'm not optimistic.
In the mean time, the script runs at pretty low frequency and we are advised to tell worried uses to wait two days before asking us to escalate.
I asked the team to look into it. They report nothing actionable.
If there was an attack involved and the responsible party continues it will eventually show up on some of our tracking tools. I'll keep an eye on it.
The script runs at night (in the UTC timezone), so it hasn't run yet. Wait for tomorrow, then it should have run and likely invalidated the votes, if they are actual serial downvotes.
It is not (yet?) significantly anomalous pattern according to the criteria used by the system.
The engine would definitely detect this serial voting and will also reverse it for sure...
But, it takes up to a maximum of 24 hours.
If you still have a doubt, you could have a look at my profile. I was a bit confused on that serial-upvoted day. The reversing thing made me laugh on the next day :-)