intresting error(bug?)

[Szukács István]

i have a freebsd 5.4 server

ifconfig
fxp0: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> mtu 1500
        options=8<VLAN_MTU>
        inet 195.xxx.157.214 netmask 0xffffffe0 broadcast 195.228.157.223
        inet6 fe80::211:11ff:fe56:ec80%fxp0 prefixlen 64 scopeid 0x1
        inet6 3ffe:401c:430::1 prefixlen 64
        ether 00:11:11:56:ec:80
        media: Ethernet autoselect (100baseTX <full-duplex>)
        status: active

nat on $ext_if              from 127.1.0.0/16   to any -> ($ext_if)

i just realised that in my jail every second connection is working.
i check the pfctl -ss

 self tcp 127.1.0.1:53321 -> 10.0.0.4:61360 -> 
195.228.157.253:6667       SYN_SENT:CLOSED

wtf??

why 10.0.0.4? The last week we tested some vpn-s here and then i use 
this ip temporary for testing, after i delete it

ifconfig fxp0 add -alias 10.0.0.4 0xffffff00

but the pf use it for NAT  like it is still exists there

i changed my rules

nat on $ext_if              from 127.1.0.0/16   to any -> 195.xxx.157.214

now it is working but my question is why pf  still use this ip even it 
is no more exists there
(i reloaded the ruleset and flushed the state table before)
(sorry for my english)