[Plugin: W3 Total Cache] Problem with redirection

I’ve installed W3 Total Cache 0.9.1.3 on my domain http://www.demaweb.dk/. On my other domain http://www.cykelkom.dk/ I’ve created a DNS rewrite to my main domain. But as you can see, it’s rewriting to: http://www.demaweb.dk/wp-content/w3tc/pgcache/_index.html.gzip. Why?