PC Bug?
I don't know if anyone has noticed this yet but my brother and I found this weird.
Training your players/team will increase your players'/teams' rating, no? Then, have you ever wondered why none of your players ratings remain unchanged? Take a look at your team's rating before a game (when you select your controller).
My solution: Try editing your player (like make him wear goggles and then remove) and see the results reflected in your ratings.
I've done this in my Dynasty mode using my whole Dallas (fantasy) team. Tell me what you think.