pf ftp question (read pls)

first of all, hello to you all
second, let's get back to business.

my system: freebsd 6.2 with pf as firewall. issue: the ftp thinghy. I  
managed to make it work using ftp-proxy but that's not the problem in  
matter here. The problem, my question, is why doesn't pf leave alone the  
20:21 port. instead of filtering it, or whatever it does to it, why, when  
i tell it to leave open and not to touch it, it keeps filtering it. the  
port is open but there is still a control rutine from pf there....why  
doesn't it simply leave it alone ?any way of doing that? i've been  
google'ing and will still keep on doing it until i find something useful.

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