Why are post numbers so decieving

[Romextly]

So Whenever I see a nation, I always see the number of posts below the flag. But when I click on the name, I see that they made even more posts
An extreme example:

Why is this?

[Leutria]

Posts in forum 7 do not count to the “official” post count, but are included in that other total.

[Romextly]

Posts in forum 7 do not count to the “official” post count, but are included in that other total.

Oh, ok. Thx