There should only be 2 scenes in chapter 10.
Since chapter 10/season 2 is launched as a separate game, it only shows gallery scenes available in season 2 because viewing scenes in season 1 from season 2's executable/application would result in an error. If you're before chapter 10 and you only get 2 scenes in the gallery then there is something wrong.
I've played a couple other games that tend to split into 2 separate games at some point and they've done similar things with their galleries. My Time with You for instance has "book 2" as a separate game and it only shows scenes from book 2 in the gallery once you reach that splitting point.