Blocking by hostname does NOT work correctly x32 v3.8.65951.477

Operating system: Windows XP Pro 32-bit SP3 + online updates
CIS version: 3.8.65951.477
Other security software: Avira Antivir 8.2.0.337
Firewall security level: Custom Policy Mode
Defense+ security level: Disabled

I wanted to block one website domain torrentreactor.net through adding it to My Blocked Network Zones. The website was blocked but also some other websites stop being available like forums.comodo.com or gadu-gadu.pl. The problem does not exist when I block the mentioned above domain via HOSTS file.

Whois information:

I wanted CIS to block:

torrentreactor.net

NS1.TORRENTREACTOR.NET 213.174.136.85 NS2.TORRENTREACTOR.NET 213.174.139.104 92.61.248.102, 87.233.159.186

but it also blocked:

forums.comodo.com

91.199.212.149 (forums.comodo.com)

gadu-gadu.pl

91.197.13.208 (ip-91-197-13-208.gadu-gadu.pl), 91.197.13.209 (ip-91-197-13-209.gadu-gadu.pl) ns2.gadu-gadu.pl. [91.197.12.11] ns1.gadu-gadu.pl. [91.197.12.10]

and some other websites.