Well, word "off-topic" itself answers your question. You posted something what isn't related to specific topic. For example, if you posted bounty report somewhere in Bitcoin Discussion, it's off-topic obviously.
It would be easier to tell what exactly you did wrong if you would post quote of deleted post and link to thread where you posted.
P.S. You made 2826 posts and got just 1 Merit! Wow, it's really bad. Did you came here just for bounties? You don't need to answer this question...