You can access forbidden torrent sites because you are viewing them through a proxy server. And this particular ip (172.16.1.11) probably points to a proxy server inside your college that uses the HTTPS prototype and does not prohibit visiting these sites. When you first added this proxy server to Proxifier, a window appears with the message "Do you want Proxifier to use this proxy by default? You can change this later in the profile → Proxification_Rules". And if you click "Yes" here (I think you did), the software will set this server as your default proxy server.
Now open the Proxification Rules window, you will see settings such as:
Rule Name Applications Target Hosts Target Ports Action
Localhost Any localhost; 127.0.0.1; Any Direct
%ComputerName%
Default Any Any Any Proxy HTTPS
172.16.1.11
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