This looks weird to me.

• Kbin downvotes are public, you can see who made them at https://kbin.social/u/@artifice@lemmy.world. Kbin doesn't federate downvotes from Lemmy though, so you can only see downvotes made there. I stalked your profile a bit on kbin and there was nothing weird. Mostly no downvotes, and in the few cases there were some there was no correlation of people across threads. The worst I saw was like three people downvoting a series of comments in a single thread, which is not weird or stalky.
• Downvotes are also not anonymous to Lemmy instance admins. They are recorded in Lemmy's DB with a link to who made them. This isn't exposed via the web-ui or app-api, so regular users cannot see them... but admins (and users with their own Lemmy instance) can.

I would consider reporting this to info@mastodon.world. If someone is actually sockpuppeting 10-20 accounts and profile stalking, that sounds to me like bannable abuse and something the admins might be interested in looking into. Now, of course, if you're the one who has been harassing people in old comments, moderated comments, deleted comments, or DMs... admins might decide to ban you all. Two wrongs don't make a right, and often result in two bans. It's also possible that admins have bigger fish to fry and won't have time to investigate... but if I were admin I'd be interested in early instances of mass-sockpuppeting so I could think about ways to detect and react to it.

Edit: As an aside, the animated profile icon is pretty annoying and it may be that people downvote just for that.

Activity on your account certainly seems unusual. This post is getting 1 downvote a minute when I'm reading it, which is more engagement than usually happens on Lemmy, good or bad.

There is currently a fascist brigade attempting to inflict itself on the fediverse. It’s possibly related, they do use bots.

Fortunately accounts are free and the points meaningless.

But, you could find out. Abandon this account for a time and come back. If the insta-downvotes start again then you know it's bots, if not then you get to laugh at the someone or someones that wasted all that time... Well they still wasted their time even to set up bots but you know what I mean.

You could also ignore or migrate. I don't think Lemmy is equipped to tackle this kind of trolling, except that accounts are free and the points meaningless. To me that's solution enough, YMMV on how attached you get to your account though.

I'm having a similar problem, where someone mass downvoted all my comments and posts going back a month. It doesn't seem to be ongoing though, but a one time event.

My post here: https://sh.itjust.works/post/1984538

Stop caring about upboats. Say what you want. This is not Reddit.

Iirc, the names of the accounts making up- and down-votes is part of the information that's synced between instances, and so available to admins if they care to look. Wonder if there could be some sort of mod tool to identify coordinated vote manipulation