I replaced all my PlayerPrefs and PlayerPrefsX actions with PlayerPrefsQ. I'll let you know soon if they work.
EDIT: For some unknown reason, PlayerPrefsQ Get/Set actions didn't work. However, I found some problems into my FSMs that stopped my prefs from saving. However, PlayerPrefsQ Save works as long as my prefs are saves both in my editor and on my tablet. Thank you for the help !