GameUserSettings.ini is one of the primary files for making configuration changes to an ARK:Survival Evolved servers. If your GameUserSettings.ini file is resetting on server restart, this usually means there is an error in the file. This is often due to either a syntax error, or required settings missing from the file.
Before making any modifications to this file, please create a backup of it so you can restore it in case the file is reset again.
Note: The GameUserSettings.ini file should not be used to set your mod as it will be overwritten by your server's ark.properties file.