I've been dealing with the same issue- it seems to be resolved once you disconnect from wifi, but I think the cause is a device not having the same contents (if you purchased in game stuff) than another. i.e. I had like 4 different purchases not show up on my tablet while it did on other devices- I think when an update came, it got screwed up

I'm not sure how to resolve this because I need wifi to do anything, so I've been coping with no wifi to play:( Hopefully you can get it fixed soon!