I think the T16 is an open transmitter which means it could have a default mix involved. You will have to go into the programming and cancel the mixing.
Sport Cub S is a great plane to start out with. Builds confidence for new pilots with SAFE mode. Just don't use SAFE all the time, even though it is fun to fly out of the box, because it does everything for you, it doesn't teach you how to fly. You will want to switch from beginner to novice to expert as you get better. Even on expert you still have the panic button to get you out of a nasty crash.