When I go into config to turn instant placer on, place delay 0, and timeout 2 and turn everything on and I exit out back into inecraft none of the options that I put on saves. Anyone have any ideas why they do not save? I am running on 1.12

Could you please try to manually edit the config file inside the .minecraft folder to check if that setting persist across multiple game re-runs?

when you exit out of config, press the done button, not the escape key.