Ping behavior and ACL

I have set up a simple lab with 2 routers (R1, R2) connected over a point-to-poing serial link.

R1 ----------------------- R2

I have configured an ACL on R1 router as follows:
"access-list 100 permit icmp any any"
and applied inbound on the R1's serial interface.

My question is why when I ping from R2 to R1 with repeat count of 1 I get 3 matches on R1's ACL?

Also, when I disable CEF on R1's serial interface where the ACL is applied I get 2 matches per packet.

Finally, when I add the "log" keyword at the end of the ACL I get 1 match per ping packet as I expected from the beginning.

Anyone has a clue what's going on?

Thanks in advance

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