create duplicate content within the Google webmaster

I’m using this plugin, for the next few months I saw google webmaster has told me, that there is an error in the article. Notice of duplicate content to tens of thousands each article. Example, for one title, they can make two titles the same article in another version. / 2010/10/flashdisk-motorola-4g-usb-lte-7110 /? Wpmp_switcher = desktop
/ 2010/10/flashdisk-motorola-4g-usb-lte-7110 /? Wpmp_switcher = mobile

I do not know what else to do, slowly this blog gets sentenced to a decrease in page rank for the entire article I seeded. Up to a 5 per cent of the actual traffic.