It is not a viewport solution, checks the user agent on server side. It only checks if the current device is mobile or not. The iPad should fall into the desktop category by the script. Either one or the other must be displayed. In case you are using a page builder or something similar of some sort, make sure the container module is not hidden on tablet devices.
If nothing works, can you please add temporary FTP and back-end access? I would like to check what is on the output there.