MikeTheCodeRevolution Hey again!
As I've seen you're using external hosting into google drive cloud.
Please, make you sure, all ItemsAdder folders are same. Same config.yml(only hosting part can to not be same), same contents folder.
Then make sure, you're using same URL to the RP download.
If this does not help, I think you will need to use self-host on main server(you should decide which it will be)
Because sometimes these external hosts are buggy is best to decide use self-host. But be sure to have open port to use.
And I see you are using ViaVersion, are you using this plugin only on lobby or on other servers too?
Your second log file is empty