is anyone else experiencing this?
Unless this is widespread, it could be a connection issue. The Campaign runs entirely "Client-side" (ie on your phone/device). If you run campaign 1,2,3,4,5,... but the server doesn't receive say, 3, it won't accept anything after that either. There should be some sorta error detection that lets you know, but I don't believe there is. Your phone will keep going as if nothing is wrong and the server will keep rejecting anything after the dropped point. Log out n back in and it will re-sync with the point the server is waiting on.