Quote from: PytagoraZ on Today at 01:58:35 PM

My question is:
1] How could this happen?
2] Does he delete all posts and activity will go back to the beginning?
3] If I'm not mistaken, he should at least be a hero member
4] Is this normal? or am I the one who doesn't know about phenomena like this?

If you delete a relatively large number of your posts - especially if the number your post is lower than your activity points, your activity will follow suit.
Yes - user activity will be 0 only if he deletes all his posts. But while he can't do it without the help of a moderator - that's because maybe some of his posts are on a board that can't be deleted.
- Sure - the rank is hero, innitial merit proves it.
- That's normal- of course. However, some spammer do it to remove traces of posts or evidence. But I don't think the user you mentioned is a cheater. But if you want to know more - then ask the user what his main goal is.