Milter-greylist

I thought I had p0f working, but I’m seeing this in the logs:

Apr  7 15:25:13 planx milter-greylist: p0f reply id mismatch 0 expected 2db21
Apr  7 15:25:18 planx milter-greylist: t37FPDKr005463: addr [185.32.183.11][185.32.183.11] from <Topdollar4homes@...> to <idbill@...> blacklisted (ACL 1654)

yet, it appears p0f is actually working...

[root@planx ~]# ~idbill/p0f-client /var/run/p0f 185.32.183.11
First seen    = 2015/04/07 15:25:13
Last update   = 2015/04/07 15:25:13
Total flows   = 1
Detected OS   = Linux 3.1-3.10
HTTP software = ???
Network link  = Ethernet or modem
Language      = ???
Distance      = 10
Uptime        = 0 days 6 hrs 32 min (modulo 49 days)

Could this be a backward compatibility issue with p0f v2 and v3 in relation to filter-greylist?

Bill