I'm not a mod, but as far as I can tell you've only made 2 posts that count. Most of your posts were on the "New? Start Here" and those posts never count (I think because basically a lot of people were just going around saying "Welcome" to everyone to get their post count up). So nobody's gone and changed your post count, it's just that some of the posts were automatically not counted in the first place.
I know post count seems very important at first but don't worry about it too much and eventually you'll get there. Also, it's important to remember that non-quality posts (eg one-word messages/just saying "I agree" or "That's great") don't count. If people post a lot of non-quality messages then the mods can go and reduce their post count until they've posted enough good posts (but I don't think this is what's happened in your case).
Yes. See this thread for a list of what you can and can't do.
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