I would try to delete the longitude from the “Microsoft Flight Simulator/Official/One Store” folder and redownload it from the content manager in the game
And I’m not sure, what you did there. The mod only works if you replace the layout.json file in the “Flight Simulator/Official/One Store” folder. So if you say you were just using the community folder you did it wrong and it shouldn’t work.
What do you mean by “default Longitude AC files”? And what is “the Community file”?
Also if you didn’t change anything in the OneStore folder, you can just delete anything related in the Community folder and it should be fine.