That's expected if you use services such as screenfly, etc

They are not services that emulates a real mobile device so obviously they won't return the mobile version. They simply shows the desktop website inside a browser iframe.

Use the integrated device emulator or the Google Chrome emulator in the DevTools.
Take care to have correctly configured the component, the template switcher must be enabled and active, all other extensions managing mobile if any must be turned off, all the caches, cache plugins, plugins such as JCH Optimize, etc must be turned off.

Regards