You scared me. I spent the last 4 days trying to figure out why I cannot get sub pages to display different menus. Sometimes it does, sometimes it doesn’t. I haven’t solved that yet but if it wasn’t going to work on mobile, there was no point to keep pursuing it.
For what it’s worth, I just tested my test site on a Windows Phone 8.1 device and (one of my working sites) worked. Not a great sample size and not a common device but it’s something.
Same thing to me. Works perfectly on a desktop. But on mobile, it is not working – neither Android nor iOS. Divi theme is used.
I have the same problem. The menus work well since a computer or a tablet, but not since a mobile (smartphone).
What is the solution?