So, for some reason everytime i put in a new config for another mod into the epic fight config, it deletes whatever i put in immediately after booting up the game. i have a feeling that i'm probably just doing something wrong, but i have no idea how to fix it.

1.18+ doens't support the config folder since they are deprecate. If you want to add custom weapondry, create a datapack. If you need help, feel free to ask in the discord server https://discord.gg/ReqrdPMpBv