Can't really capture a screenshot of this so I'll just have to describe it:
Running the iOS demo app built from JUCE git there seems to be a rendering glitch with popup menus and combo boxes. When the menu is opened it's first rendered far too large and offset quite a bit down and to the right, enough to take up a large section of the whole screen. This only flashes for an instant and then the menu is redrawn at the proper position and size. I can reproduce this in my own simple app built from scratch in the IntroJucer.
Looks like the initial bounds are being calculated incorrectly for some reason and then quickly fixed.