It also happened to me nowadays. I remembered when i was a newbie, i always post in any thread on my local board. Though, my posts are constructive. I realized then, the mods are deleting similar threads. One campaign manager told me that don't post on thread with more than 10 pages as it likely to be removed. Try to pick only relevant threads. best one is interesting relevant news with links.
Well some threads are also repeatedly made, having the same topic wouldnt get you any far from being deleted.
Deleted posts and threads are continuous. Our forum is very saturated by signature spammers. Although I am in a campaign, and this is the only thing I can do around here ( graduating student issues ) , I prefer to avoid it. Getting g paid is my goal but never spamming or cheating.
Deleted posts don't even bother me. I think that you are a campaigner too that i s why you are bothered with your posts count or rank. Just calm down dude. Just do your work. A quality work. It's great having this opportunity.