rfc 1918?

Hello, Does anyone know why I get inbound packets from 10.x.x.x coming from my ISP, UUNet? They're just headed for a webserver, so it's not likely that they're up to no good. This seems to violate rfc 1918. Am I crazy? Feb 22 15:29:48 computerjobs-gw 353094: Feb 22 20:30:10.439 UTC: %SEC-6-IPACCESSLOGP: list 135 denied tcp 10.10.5.18(62438) -> 63.67.217.184(80), 1 packet Feb 22 15:30:02 computerjobs-gw 353095: Feb 22 20:30:24.024 UTC: %SEC-6-IPACCESSLOGP: list 135 denied tcp 10.10.5.18(62440) -> 63.67.217.184(80), 1 packet Feb 22 15:30:06 computerjobs-gw 353096: Feb 22 20:30:28.168 UTC: %SEC-6-IPACCESSLOGP: list 135 denied tcp 10.10.5.18(62455) -> 63.67.217.184(80), 1 packet