Referrers are not showing up under Top lists >> Referers
You must always track your homepage or entry page, the first page on your site where visitors land.
If you do not, then Opentracker will register your visitors as having been referred to you by your homepage, or the first page they landed.
The referrer is derived from 'one page back', or the 'page before', i.e. one page before landing on the first page you are tracking.