Hi Philippe, thanks for testing the reported issue.
It seems only happened on Safari (desktop, iPhone or iPad). There is no problem on other browsers (IE, FF, Chrome).
Note that in my mobile app, I've set the following entries in the xsp.properties:
xsp.theme.mobile=iphone
xsp.theme.mobile.android=android
xsp.theme.mobile.iphone=iphone
xsp.theme.mobile.pagePrefix=Mobile