Thanks for the solution, I will read it.
Just for information, I have founded a old test with the same template (the shortcode full size with a page template blank page) that was under wp 3.9 and Alora 2.5. When I looking for on my smartphone under the default navigator android, it worked correctly.
I updated to version Alora 2.7 and wp 4.2.1, and at this moment it no longer works correctly !! I encounter the same problem as the hairdresser project !!