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I know it's a painful experience, and it hurts, but there's nothing much to do about it except move on. I am no campaign manager, but I think what Hhampuz did wasn't a mistake. He counted the posts according to how he saw them.
It's just like you making the 20 post minimum required, but then 2 post get deleted before the manager makes any counting. He will only consider the 18 he sees
My other piece of advice is to avoid "gambling" posts that you think mods are very likely to delete or move to another board