OK I think I have found the problem: I'm trying to use the mobile feature of Hyper Cache on a responsive template, and not on a separate mobile theme. In fact, the plugin doesn't support separate mobile cache for responsive template. So I'm obliged to disable serving different image sizes according the device (that is improving performance and fast loading) and serve the same homepage for all devices if I want still to use Hyper Cache, untill author of the plugin decides to implement a separate cache even for same template but with different thumbnail sizes.
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