I've designed my site on wordpress and was using a mobile version plugin. But I found out that my homepage wasn't opening on the mobile version but posts page.I've no idea if its because of that particular theme I'm using or if I need to do some coding.
I suggest you to check if this plugin rely on some redirect and to see if you could change the settings. I guess it's redirect because if it was just responsive design it wouldn't change the page you land after typing the domain.