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You have one more post the the one you had before?
I think it takes the system a few seconds to adjust when you make a new post or delete a post to the number shown on your post count. This is possibly why your post count is shown as above.
I assume that was immediately after you posted the second post.
If so, the difference is because the page is not actually re-loaded when you reply, so any previous posts will show the old post count. If you re-load the thread, you should see that the numbers match.