I tried reinstalling the mod and all, but my changes don't save at all when re-entering Minecraft. (the config file decides to regenerate with default values)
I tried copy-pasting a config from another modpack, but guess what, the config still regenerates, no changes being saved, all done when Minecraft was closed.

i kept trying, yet still doesnt work. 6-7 days later... still no support... very great support team....

whoops.

@samz0261 It's a free project ran by hobbyists, there is no support team.

The config file is regenerated by Forge when it detects invalid user input.

@AveragePizza The mobs are invisible when the config file on the client and server do not match.

When entering the other modpack and the mod loads, the config file stays the same.

ive got the same issue here adding to it that the mobs are invisible and still make noises and attack, was it a mod conflict that you had