Not being able to turn on individual apps for cellular data after iOS 9

So I was exited when I saw there was an update to improve the battery life on the iPhone but when I update, I now can't turn my app data back on which is really annoying because I have apps have been turned off that I need on a daily bases and I have been forced to work around it. I have looked everywhere for a fix and have done all of the basic things like restart and reset all settings but they don't work. I would rather not try a restore as I have had big problems when going to use a back up before. However, if there is no fix by the end of the week then I will have to try. Does anyone have the same problem as me? Does anyone know real true fix to this problem? Anyway thank our all for reading and I hope that you can help!