Why my aptitude changes my tor package?

[James Brown]

Somedays ago my aptitude authomatically installed the new Tor version
'0.2.1.29-1~~lenny+1' from http://deb.torproject.org/torproject.org
Today it have replaced it to such version 'http://security.debian.org'
Why? Is it normal?

My /etc/apt/sources.list:

deb http://ftp.debian.org/debian/ lenny main non-free contrib
deb-src http://ftp.debian.org/debian/ lenny main non-free contrib
deb http://ftp.debian.org/debian/ testing main non-free contrib
deb-src http://ftp.debian.org/debian/ testing  main non-free contrib

deb http://security.debian.org/ lenny/updates main contrib non-free
deb-src http://security.debian.org/ lenny/updates main contrib non-free
deb http://security.debian.org/ testing/updates main contrib non-free
deb-src http://security.debian.org/ testing/updates main contrib non-free

deb http://volatile.debian.org/debian-volatile lenny/volatile main
contrib non-free
deb-src http://volatile.debian.org/debian-volatile lenny/volatile main
contrib non-free

deb     http://deb.torproject.org/torproject.org lenny main

OS - Debian Lenny AMD64,
uname -a
Linux JAMES 2.6.32-bpo.5-amd64 #1 SMP Mon Dec 13 17:10:39 UTC 2010
x86_64 GNU/Linux
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