Um, are you sure? The existence of that Data folder does not matter. What matters is where the game will look for content. You are saying the game will ALSO look for content in steamapps/common/Starfield/Data? Because to my knowledge, the game only load loose files over Document folder. Once again, the existence of the extra Data folder does not matter. You can have "Data/Data/Data/Data/", the game will simply not find content in there, thus render the existence of these folders irrelevant, but harmless. However, the moment you see "Data/Data", it rather hint that some mod is installed incorrectly. What you should do is to go into the second Data folder to fish out any content and cut/copy them to the main Data folder. Simply deleting Data folder will not help. The way computer works, it has a specific file path to look for things. It does not care how your file structures are. You can have 1000 Data folders and the game wouldn't know or care. But if your content is not exactly at the right path, the game will simply not load it.