Were any of the posts in the alternate cryptocurrencies board or in games and rounds, off-topic, or this thread? The rules were changed recently so that these posts aren't counted. They'll still show up when you go to http://bitmixer.io/signature.html but they'll be automatically deducted from your final post count during payment.

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EDIT: I just looked at your posting history and it looks like most of your posts weren't in the above boards (which is good!) although some posts were under the 75 character limit. That could be the reason why.