Sometimes mods delete mega threads. Say on any of these mega threads, you had few posts means all those post lost.
Yep, that was my first thought. He said he just started his first bounty and lost activity points--that means to me that he's only posting in those shitty threads that no one reads and ones that mods end up deleting, just like 99% of bounty participants do. And surprise, surprise, he's started a thread about losing activity instead of looking for answers (though this one in particular doesn't come up too often).
OP: If you're making posts in Altcoin Discussion, Bitcoin Discussion, or Economics, you run the risk of having your posts deleted. When a moderator decides to trash a thread that's useless, your post(s) are deleted too and you won't receive any notification. Try to avoid threads with many pages and that have idiotic "questions" for thread titles. Like "Why bitcoin is good?" or something like that. Those keep getting created and are destined for the trash bin. Don't be a typical shitposting bounty hunter, else you're doomed.