This is a bug with Facebook itself that we can't fix on our end. There's a log bug-report about it that this link will go to. On that page, scroll to the top and use the form to submit your Page as one affected. Hopefully Facebook will be able to fix yours soon, but as you'll see from the thread, it can take a while:
developers.facebook.com/bugs/1051463851558493/
I hope that helps,
Alex
Page Not found - using iPhone
