@DukeZhou Incredible. I've downvoted some answers (which I deemed low quality), but the downvotes have been reverted. Are you responsible for this?

If you really did this (and this is the only explanation), I will definitely stop contributing to this community. If you really did this, you disrespected me.

@nbro: If they were mostly against the same user account (which given commenst from a few days ago above seems likely), then this is done algorithmically by Stack Exchange bots. You may see a message such as "serial downvote reverted" or similar

I don't see such a message, but this situation is incredible

The algorithm is specifically designed to prevent users targetting each other

So if you have searched out a specific user, found all their posts that you think deserve downvoting, then that will most likely get rolled back

IIRC the message definitely appears on a targetted user's account. I have been targetted before with ~ 10 downvotes in short period of time, only to have my rep restored with a message to that effect

You might not see that on your own account as a downvoter

@nbro: Well I can see this: ai.stackexchange.com/users/11571/… . . . of course I don't know if that was you, but the "voting corrected" thing is I think automated

@NeilSlater Votes are supposed to be private, but, yes, in certain cases, it was me, but not all my votes have been reverted. I've spent time to read all these posts for nothing. The stupid system (or algorithm) is working (sarcasm).

Help Center > Reputation & Moderation says

> When a single user continually votes (up or down) on many of your posts within a short period of time, the system considers these votes to be invalid and removes them. This could happen for a variety of reasons, such as a user finding a user's great answer and visiting all of their posts to upvote them, or a user getting into an argument with another user and downvoting their posts indiscriminately in revenge.

> No matter the cause, this sort of systematic targeted voting is not considered normal behavior and the system will not allow it.

> If such a voting pattern continues to happen between two users mutually or from one user towards another, or otherwise falls outside of normal voting patterns, moderators and/or developers may investigate the matter; intentionally voting merely to reduce or inflate another user's reputation is considered abuse.

> Such votes will generally be invalidated as part of an automated process that runs every day, but may also be invalidated manually by the staff after an investigation. When the votes are invalidated, the reputation gain or loss from the votes is undone, which results in a record in the recipient's reputation history labelled "voting corrected".

In most cases, I think this is might be a good thing, but not in this case.

It further states

> Should I be concerned about these correction statements on my profile?

> No, not at all. It's only an indication of reputation change. After all, we can't control the actions of other users.

I think this page contains very consistent information (sarcasm).

So, what should I do now? Only downvote one answer per day? How can I ensure that my downvotes will not be reverted again?

Tip of the day: if a certain user should be investigated on a content perspective, it's possible to enter a string like “user:11571 NEAT” into the search box. The example will search only for postings created by me about the topic of neuroevolution. This allows to determine, what a certain user but not the forum knows about the subject.

@nbro: What you should do is vote on content as you consume it normally on the site. Use the tools available on the site (such as question and answer review queues) if you want to spend time and effort cleaning up the site.

If you think any other user is causing a problem, then flag a suitable example with a custom mod flag, explaining the situation as you see it.

@NeilSlater What do you think moderators can do in this case? Moderators have not been doing their job well on this site.

I downvoted the answers that need to be downvoted. And I will downvote them again, if it takes 1 day or 1 month.

This user can troll all of you, but he will not troll me.

@nbro: The moderators make decisions about what acceptable user behaviour is. That's one of the tougher and less fun parts of the job.

@nbro please don't because if I recall correctly Douglas did the same against you and got banned (don't know by who though).

@DuttaA Yes, he got banned because I reported him, but I was not the only one that reported him. Dennis had already observed his weird behaviour before my arrival. It was Dennis who told me that he's got multiple accounts on this site. However, in this case, I am not downvoting because I am taking revenge. I am downvoting because I think that those answers need to be downvoted (because they are out-of-context or, in general, low quality).

I agree with @NeilSlater assessment, it is quite easy to get carried away. Some of the users legit answers (if it exists) might get deleted if we purge the users entire contribution and its quite difficult to assert which are legit answers and which are not.

I won't blame the mods but I think a ban might be necessary here.

And then if the user continues then maybe longer bans.

This should have been done a long time ago.

I didn't know moderators could directly ban a user (I thought only super-moderators could, like JNat or Robert Cartaino), but, apparently, they can!