[Plugin: WP Super Cache] Strange behaviour in supercache folder

Ok, I’ve just came across another strange thing – it may point to the cause of the supercache plugin not working for me. When I turn on wp-supercache, the folder supercache/mydomain/ generates a random post folder. It contains the correct index.html for that post. When I disable the plugin the supercache/mydomain.disabled/ folder also generates a couple of random post folders. Neither one of these post pages I actually loaded when the plugin was on. What’s going on here? Does this have to do with the enforce www issue?