Ipfw on the fritz?

[Mark]

Eek, I just got these eery messages in /var/log/messages:

Sep 18 02:00:18 asarian-host /kernel: OUCH! cannot remove rule, count 1
Sep 18 02:00:18 asarian-host /kernel: OUCH! cannot remove rule, count 1
Sep 18 02:00:18 asarian-host /kernel: OUCH! cannot remove rule, count 2
Sep 18 02:00:18 asarian-host /kernel: OUCH! cannot remove rule, count 2
Sep 18 02:00:18 asarian-host /kernel: OUCH! cannot remove rule, count 1
Sep 18 02:00:18 asarian-host /kernel: OUCH! cannot remove rule, count 1

That does not look good. :( I run FreeBSD 4.7R. Today I added a few rules
using "limit src-addr". Could that be it? And what does it mean? Are some
rules broken after this? I never had this happen before. Why would ipfw even
want to remove rules?

Baffled & Concerned,

- Mark