Thank you for the Hint
It was jQuery Updater that caused the problem
Regards
Thanks Ruco
I have been trying with several plugin (like jetpack, wp touch mobile plugin, wp mobile detector), but I didn’t manage to find a solution. I always get “no result” and I don’t understand why it happens and or what does it means.
Using Wp mobile detector I see the right view on the backend preview of the plugin but it doesn’t appear to work properly on mobile devices -> https://www.dropbox.com/s/n04tsaiqzuuu86d/screenshot1.png?dl=0
I also disabled the visul composery on mobile because I thought this could be the problem but without any good results.
any suggest?