Mesh not displayed correctly on mobile

I have an environment with 100k vertices that is not displayed properly on an iPad (air).
Everything is displayed properly on the desktop app, but not on the mobile one.

This is the desktop preview: https://dl.dropboxusercontent.com/u/98141518/UE_Desktop.png
And this is the iPad preview: https://dl.dropboxusercontent.com/u/98141518/UE_iPad.PNG

Any ideas why this is happening?

Darn it, your links are down.

I’d be interested in seeing them or if you found a resolution, as I think you may have the same problem I do (here: https://answers.unrealengine.com/questions/121963/mobile-material-rendering-issue-on-some-mesh-eleme.html )

Regards,
James