Tbh we here are no developer of this game so almost noone can help you, or this game has too many bugs for people to even notice that one.
And furthermore you dont need to give a shit about class and weapon or anything. They really dont affect the gameplay much.
You can just edit the save file and cheat your way through the game. Like me for example, I turned on both genders so I can enjoy CG as both, and also turn on every origin and classes to unlock class quests and CG and shit.
And tbh I edit HP, MP, ATK, DEF, etc in most RPG Maker games I play as maximum 9999 and get all the items, so I dont have to waste time doing some bullshit quests and progress gameplay faster. You can probably do the same.