Is there a thing like getting shadowbanned from downvoting on devrant or people just running bots that automatically upvote them if they hit negative upvotes?

Whenever I downvote anything thats at 0 upvotes (for ex. even spam that just didnt get noticed, where I cant report it on desktop), it instantly gets nulled, even on the most hidden and old rants.

I dont think theres always a registered user per every single rant out there at any given time that upvotes somebody. (often very deep down the comments)