Nginx converting all http links automatically to https

I've setup a simple cms in php and mysql (Percona) and used nginx as webserver. However, nginx feels the need to convert all http links to https links and thus are not loading.
Why is that? This is my nginx configuration file:
http://pastebin.com/3QLdhg1u
I explicitly told nginx not to use https in the fastcgi part but it ignores that...

Thanks in advance!