I'm having the same issue... I'll have to try to delete that data when I'm home.
For the developers. It might be related to a warning I got when I first install the Iphone app.
It said that syncing had been disabled because I ran out of space on my phone(or something close).
I then deleted a whole bunch of items on my phone to free up space, and ended up reinstalling the Lightroom app.
I really hope deleting data will solve this problem.. I just signed up for Photography CC and this app was one of my main reasons to buy.
Maybe an option to delete all mobile data from your phone would be a good option.
Cheers
Gray