@jimp:
If the data hits your router, it's a packet you received. If the packet was dropped/rejected, your ISP may not know that, they just know that the packet was transmitted to you.
Odd that it doubled, that doesn't make a whole lot of sense.
It isn't odd. The rejected packets are expected by the clients behind the box. Since they will not acknowledge the receipt of the packets that were dropped, the packets get retransmitted at the source again after a certain time when the source doesn't receive an receipt confirmation from the client(s) behind the pfsense box.