Thank you for your answer, the thing is I was in dev mode so my menu never show up and I don't have to choose between normal and hard mode, so I think the game is assuming I'm playing in hard mode.
Now I go through the menu to launch the game and it indeed ask me to choose, so there wasn't really any problem... Sorry for the inconvenience, thank you again for your help !
Edit : Well now I have another issue : there is no tinderboxes in my FC, I wanted the player to be able to save with save points in hard mode, but since the autosave doesn't work, I don't know if that's possible