Has anyone noticed disappearing achievements with OF when playing the same game on both iPad and iPhone? I was playing Space Invaders Infinity Gene on the iPad last night, and got a few achievements (although they seemed to take a few hours after I played to actually show up on OF) Today I played on the phone, and noticed none of those achievements were showing up as unlocked, although they were in GameCenter. Went back to the iPad, and the ones I unlocked again show up as locked in OF. Very frustrating.
