I had all of these issues and got so frustrated with the beta problems, I completely stopped using FC last unit. I had a system that was working so smoothly for the first half of MS1, then I started getting a ton of repeaters, huge blocks of questions in the same topic, flagged topics weren't appearing, etc.
It takes dedication to spend at least an hour every single day doing FC as it was, but I liked the results I was getting on the desktop version.
Once I started dealing with all the other crap in a tough biochem unit, I put it aside. I am planning to make a comeback this unit, but I'm not touching Beta/mobile until it's fixed.