It’s not a big issue. But several days ago my contribution score was positive, and today I suddenly found it became -16. I didn’t post any new things in recent days (except for this one).
So did Codeforces change its way to calculate the contribution scores in recent days?
Or someone was deliberately trying to gather many users to downvote my comments (I don’t think this is likely because I didn’t see any obvious changes to my previous comments’ voting). (Update: it seems that the number of downvotes won’t show if it’s small, so it could be the case that someone just downvoted all of my comments, and this is disgusting.)
Or does Codeforces have a complain system so someone else just reported my account (with no reasonable reason)?
Update: it is still changing after I posted this post.