NGUI elements causing some sort of ghosting/screen tearing issue

[Naked_Chicken]

The NGUI elements in my scene are getting some sort of weird artifacting. I'm not even sure what to call it but I can't figure out what's causing it.

The artifacting moves over time as you can see in the attachments. It seems to rotate. But it only happens to the NGUI elements.

This only seems to happen on iPhone5 so far. It does not do it while playing in the editor at iPhone 5 resolution though.
Anyone have any ideas?

Edit:
As far as I can tell, this has something to do with the fact that I'm changing the orthographic size of my camera.

[ArenMook]

This looks like something that would happen if you were changing the view rect for the camera, leaving parts of the screen not cleared as a result. Most commonly associated with rapid flickering in the non-cleared area.