I think the Top Topic Starters include MOVED-topics, that explains why several Mods are in the list (Xal0lex started 3 times more topics than he has posts).
That's right. Since topics like MOVED carry purely technical information, it was decided at the top to remove them from consideration. That is why they are not taken into account when displaying the number of posts. That is why there is such a discrepancy in the display of statistics.